Y-DNA – Griffis Family

March 17, 2023June 4, 2024

Is the Huntington NY Griff(is)(es)(ith) Family Name Welsh?

Based on a number of sources of supporting evidence, it is strongly believed that the Griff(is)(es)(ith)) surname of the family is a Welsh surname. Based on oral family stories it is beleived that the family came from Wales. [1] The documented variability of the surname spellings of the twelve children and descendants of William Griffis in America (e.g. Griffith, Griffis, Griffes) is also reflective of the historic characteristics associated with the evolution of Welsh surnames. [2]

In addition, aside from the Dutch and French, the Welsh together with the Scotts and English were some of the earliest colonists to arrive in America in the 1600’s and 1700’s. [3] Many of the Welsh that came to the colonies were either residing in England or from southern Wales. The southern region of Wales is located just across the Bristol Channel from what was then England’s second largest port city, Bristol. The port of Bristol supplied thousands of emigrants to England during the 17th and 18th centuries.

“Estimates suggest that at least 6,000 Welsh-born persons had settled in London in the early seventeenth century, amounting to some seven per cent of the capital’s resident population.” [4]

To a large degree, the Welsh that initially immigrated with the English to the colonies in the 1600’s came from the English ports of Bristol and London. [5] The influx of the first major wave of Welsh immigrants to America began in the mid to late 1600s. While there were movements of individuals, the majority transferred in denominational groups and settled together in small communities. Between the Restoration (1660) and the turn of the century, it is estimated that about 3,000 individuals of Welsh descent came to the colonies. [6] It is not known how many arrived prior to 1660.

“Some few people from Wales did emigrate during the Laudian persecution of the 1630s to gain religious and political freedom and were active in New England in the 1650s in evangelical reform. … At the same time, Wales was experiencing extreme economic problems. To a much greater extent than England, Wales consisted of a multitude of small tenant farmers whose plight was worsening with the concentration of land and power in the grasp of a prospering minority. … It is against this background that the first sizable emigrations from Wales occur, though quality rather than quantity is the keystone. ” [7]

While not certain, through my journey of hunches, dead-ends and successful finds, there is a plausible argument that William’s ancestors came from southern Wales. It is believed that one of more of the Griffith clan traveled from Bristol to Boston or another northern port. Another possibility is that William’s ancestors were Irish or English and had the Griffith, Griffiths, or Griffis surname and emigrated from one of these ports to the colonies.

However, there is no direct proof that the patrilneal family line was Welsh, English or Irish.

Similar to the Duck Test [8] of abductive reasoning:

Family folklore has stated that the surname was of Welsh origin;
the timing of when the family immigrated to the Colonies (mid to late 1600’s) suggest they were of English or Welsh origin;
the modifications of use of the Griffith(is)(es) surname in the Colonies has the historical characteristics of the Welsh in the late transition from a patronymic to surname naming custom ;
the derivation of the Griffith name is mainly of Welsh origin, therefore I believe that
the Griffith surname is a Welsh surname.

Well, I do tend to lean toward believing my second cousin four times removed, William Case Griffis regarding his recollections of his great grandfather William Griffis. [9]

**Portrait of William Case Griffis** | **Click for Larger View.**

Nevertheless, I thought I would delve a bit more into possible Y-DNA leads and review census data and Y-DNA associated with surnames from the present and past in Great Britain and Ireland to possibly add more ‘ballast’ to the argument that the family surname reflects a paternal line that was Welsh.

The Griff(ith)(iths) Surname

The surname of the Griff(is)(es)(ith) is actually a variant of the name Griffith and Griffiths, and its Welsh form of Gruffudd or Gruffydd. It is a traditional name of Welsh origin that was originally used as a personal name and eventually used as a surname, with or without the ‘s‘ as in Griffiths. [10] The name has many variations as a result of the natural evolution of the name in Welsh, as well as the translation of the name from Welsh into both Latin and English. Common variants include Griffin, Griffith, Griffiths, Griffing, Griffes, Griffis and other variations. The anglicized and Welsh forms are treated as different spellings of the same name in Wales.

Although there is documentation that Griffith families came from north Wales, there were in fact documented more Griffiths throughout Wales and across the border in England. [11]

The name Griffith in Ireland originally appeared in Gaelic as Ó Gríobhtha, which is derived from the word “gríobhtha,” which means “griffin-like.” While most of the instances of this name in Ireland can be traced to this native Irish source, the name also came to Ireland in the 12th century with the Anglo-Norman invasion of Strongbow. In this instance, the Griffith surname is derived from the Welsh personal names Griffin, Gruffin, or Griffith, pet-forms of the Middle Welshname Gruffudd. [12]

In studies of Welsh forenames in use in Wales in the fifteenth century, it has been noted that Welsh forenames were fading while ‘new’ Anglo-Norman names were growing. However, among the ‘traditional’ Welsh forenames that continued to be used, Gruffudd represented 6 percent throughout Wales. The modern derivative, Griffths, continued to be used throughout Wales. For comparison, the figures for surnames in Wales between 1813-1837 indicate that Griffiths represented 2.8 percent of the Welsh population. [13]

Griffi(th)(iths) Surname Distribution in British & Irish Census

The Griff(is)(es)(ith) family immigrated to the colonies in the mid to late 1600’s. I have not been able to find historical documentation on the prevalence and distribution of the Griffith surname in Wales in the 1600’s or 1700’s.

Perhaps reviewing the surname distribution patterns in the late 1800’s might provide a plausible glimpse of the historic distribution patterns that were similar to the 1600’s. This of course tenuously assumes that most folks in the British Isles did not have high migration patterns within and between Wales, Ireland and England during the 1600’s through 1800’s. This is not necessarily the case. [14] The economic effects of industrialization in the mid to late 1800’s had an effect on migration patterns on the British Isles. However, assuming most families within three to four generations (1600-1800) stuck within a certain geographic radius, we might see similarities in surname distributions within Wales and on the border of England and assume this reflects, to a degree, surname distributions in the mid-1600’s.

The ten most common surnames in Wales in 1856 were Jones (13.84%), Williams (8.91%), Davies (7.09%), Thomas (5.70%), Evans (5.46%), Roberts (3.69%), Hughes (2.98%), Lewis (2.97%), Morgan (2.63%) and Griffiths (2.58%). [15]

Of these ten common Welsh surnames, only five were found throughout Wales and did not display any marked concentration in any one area: Thomas, Lewis, Griffiths, Edwards and Morris. Other common surnames included Owen, Pritchard and Parry. The popular given names from which these surnames derived, such as Jones from John, and Davies from David, clearly depict the patronymic practice. While these figures reflect all of Wales, there have been studies which document that different areas of Wales have different levels and mixtures of surnames. [16]

For example:

“(T)he ten most common names in the Uwchgwyrfai area of Caernarfonshire covered more than 90% of the population. those names (in the early part of the nineteenth century) were: Jones (22.8%), Williams (18.40%), Roberts (13.28%), Hughes (7.78%), Griffiths (7.39%), Thomas (5.37%), Owen (4.86%), Evans (4.17%), Pritchard (3.65%) and Parry (2.92%).” [17]

Given the documented broad range of presence of Griffith and Griffiths throughout Wales and neighboring counties England, I did not anticipate getting any strong clues as to the location of where the ancestors of William Griffis resided. However, I thought I might find certain counties as having an higher probability of where the ancestors of the Griff(is)(es)(ith) family were from.

Keeping an Open Mind on Welsh Surnames: Don’t Fixate on One Name

Given the history of the emergence and use of surnames among the Welsh, pedantically looking for the literal spelling of one’s present day surname in historical records or Y-DNA test kit results is unwise. It is wise to pay attention to surnames that are geographically similar to where Griffith(s) households are found especially in terms of genetic matches. Families may have used different surnames in Wales as the practice of using surnames became more widespread in specific geographical areas.

In a study of Welsh wills, John and Sheila Rowlands documented ‘patterns of decay’ in the use of the patronymic naming system in Wales. [18] They completed a study aimed at providing a means of determining areas in Wales when the use of the patronymic naming system reduced to about 10 percent of the names in a given area.

Illustration One: Patronymic Decay and the Rise of Surnames in Wales

Source: John and Sheila Rowlands, The Use of Surnames, Chapter 4, Patronymic Naming – A Survey in Transition, Llandysul, Ceredigion: Gomer Press, 2013, Figure 4-3: Decay in the use of patronymic naming to the 10% level, Page 56 | **Click for Larger View**

The map above (Illustration One), which is from their study, reveals the wide variation when surnames were adopted in various parts of Wales. Surnames became the norm by 1750 across the coastal plain of south Wales and along the eastern border with England.

It was not until the mid-nineteenth century that the Patronymic system was fully replaced in Wales. When the Welsh immigrated to America in the seventeenth and eighteenth centuries, the patronymic pattern on both sides of the Atlantic eventually stopped, and their surnames became hereditary. However, it is not uncommon to find variations of surname spellings within and between family generations in documents associated with our family members in the 1600’s and 1700’s in the colonies. The use of surnames was, compared to the curing of concrete, “wet cement” in the 1600’s and 1700’s.

The Widespread Presence of Griffith(s) surnames in Wales

A review of data from the 1881 census of Great Britain and Griffith’s Valuation in Ireland 1853-1865, indicate that the surname of Griffith and Griffiths is found in a large number of countries throughout Great Britain and Ireland. Eighty percent of the prevalence of the Griffith(s) surnames are found within 77 mile radius of Caernarfon, Wales [19]. The Griffiths surname is more prevalent by county than Griffith.

Illustration Two: Prevalence of Griffiths and Griffis Surnames in Welsh and English Counties

Looking at this data on a map in Illustration Three, one can see that households with the Griffiths and Griffith surnames are located throughout Wales. The circle with a dotted boundary indicates the 77 mile radius of the 80 percent prevalence of the two surnames in the British and Irish census data combined. Where the two surnames are relatively larger in specific counties, a small pie chart appears and portions of the pie reflecting areas proportionate to prevalence of the two surnames. Counties that have a lessor presence of the surnames are reflected with small dots. The Griffith and Griffiths surnames were present in small varying degrees in many of the counties of Great Britain and Ireland. [21]

Illustration Three: Census Prevalence of Griffith & Griffiths Surnames in England and Ireland, Mid to late 1800s

Source: Rob Spencer, Britain and Ireland SNP and Surname Mapper | **Click for Larger View**

If we look at the 1881 census data for only the Welsh counties as depicted in Table One, four of the twelve counties represent 63 percent of Welsh households that have the name Griffith or Griffith. Glamorgan has the largest proportionate presence of the Griffith(s) surnames (27%). Penbroke, Caernafon and Carmarthen are the second, third and fourth largest in representation of Griffith(s) households (15.7%, 10.4% and 10.0% respectively). While these four counties contain the largest concentration of Griffith and Griffiths households, the Griffith(s) surnames are represented in all of the Welsh counties. These two surnames are in the top ten of most popular surnames in seven of the twelve counties.

Table One: Distribution of Griffith and Griffiths Head of Households by Welsh County 1881

County	Sur- name Griff- ith/iths	Sur- name Rank of top 300 sur- Names / County	Number of House- holds in county	Percentage of Griffith(s) Households Across Counties
Anglesey	ith	14th	722	2.4 %
	iths	0	0
Brecknock	ith	175th	24	3.2%
	iths	12th	937
Caernarfon	ith	10th	2954	15.7%
	iths	12th	1697
Cardigan	ith	70th	25	4.6%
	iths	13th	1330
Carmarthen	ith	73rd	78	10.0%
	iths	8th	2842
Denbigh	ith	30th	275	6.8%
	iths	10th	1726
Flinshire	ith	64th	106	5.8%
	iths	9th	1626
Glamorgan	ith	66th	640	27.0%
	iths	10th	7362
Merioneth	ith	19th	618	2.7%
	iths	12th	787
Monmouth	ith	0	0	5.4%
	iths	19th	1605
Montgomery	ith	84th	76	4.0%
	iths	14th	1095
Penbroke	ith	84th	110	10.4%
	iths	6th	2974

Data from Rob Spencer, Britain and Ireland SNP and Surname Mapper, http://scaledinnovation.com/gg/biMapper.html

So what does this mean? In essence, the ancestors of William Griffis could conceivably be from anywhere in Great Britain given the prevalence of the Griffith(s) surnames! However, there is a good chance that his ancestors were from Wales and from southern Wales. As reflected in Illustration Four, four counties in Wales represent more than a majority of households with the name of Griffiths or Griffith. Perhaps William’s ancestors were from Glamorgan, Penbroke, Caernafon or Carmarthen counties in Wales.

Illustration Four: 1800 Map of Highlighted Welsh Counties that had the highest concentrations of Griffith(s) households in 1881

Distinctive Surname Patterns and ‘Surname Insularity’ in Wales

A review of surname distributions in Welsh counties reveals similar patterns of surnames among the Welsh counties. This is also the case when viewing the border counties between Wales and England.

Counties whose residents share the same surname distribution mixes can be considered similar. This can be represented in a quantitative manner. The example in the Illustration Five below shows four counties A-D. Counties A and C have 2 of their 3 names in common and could be called 67% similar. A and B are 33% similar and all other pairs are 0% similar. From this a dendrogram can be constructed which visually expresses these counties’ mutual surname similarity. [22]

Illustration Five: Geographic Surname Similarity Portrayed in a Dendrogram

Source: Rob Spencer, County Clustering by Surnames, Tracking Back: a website for genetic genealogy tools, experimentation, and discussion | **Click for Larger View**

Clustering the 117 counties of Britain and Ireland by surnames indicates a clear pattern where the similarity of surnames generally follows historic political boundaries. Each region of Great Britain and Ireland (Wales, Scotland, England, Ireland, and Northern Ireland) is generally characterized with its own unique cluster of surnames. One noteworthy observation is the British counties of Herefordshire and Shropshire are deeply clustered with Wales. [23]

Illustration Six: Similarity of Counties Based on the Top 500 Surnames Found in Each County in 1881 (Top 5 Surnames are listed next to Each County)

The dendrogram above basically illustrates the similarity of Welsh counties based on their unique distributions of the 500 surnames found in the respective counties. For example, Carmarthen and Glamorgan counties are more similar in their top 500 surname disributions than compared wih the other counties. Also, as an example, Shropshire’s names are more similar to Wales than England. Regional identities remain largely the same whether one examines just the very common or just the very uncommon surnames.

Surnames can be viewed as a measure of the historic influence of patronymic influence, language. lineage, and culture, and they may be shaped by political boundaries or those boundaries may be superimposed on preexisting surname patterns. The crossing of a surname pattern over a political boundary may indicate past boundaries and/or may be related to cultural or sectarian differences.

In order to compare surnames to political or historic regions Rob Spencer looked at surname differences along six tlines that crossed regional borders (see the map in Illustration Six below). Similarity between the counties at the start and end of each arrow are calculated and shown in the six charts below. On the map, the dot on each arrow shows the point where the surname pattern is halfway in terms of similarity between the counties at the ends. The red arrow on the map follows a general pattern where the smaller region (Wales) is ‘tighter’ (homogeneous in terms of Welsh surname patterns) while the larger region (English counties) bleeds into the smaller’s surname pattern (e.g. Shropshire vs Wales). This pattern is depicted in Chart Four. [24]

Illustration Seven: Six Transects through Counties in Great Britain and Ireland

Rober Spencer, County Clustering by Surname | **Click for Larger View**.

Spencer found in most cases there is an identifiable 50-50 mix in surname patterns along these six lines. If you look at the transect line between Wales and England (highlighted Chart Four below), the 50-50 mix is around Shropshire county in England. In most cases there is a flattening out at one or both ends of the transect into a stable pattern. Pembroke, Cardigan, and Montgomery Welsh counties are all self-similar and iconically Welsh without English admixture, then as the line goes eastward into England, the surname mix is predominantly English.

Charts One Through Six: Similarity of Surnames in 1881 in Border Counties in Great Britain and Ireland

Source: Rob Spencer, County Clustering by Surnames, | **Click for Larger View**

Surname Variants of Griffiths & Geographical Similarities with other Surnames

Given the history of Welsh patronymics and the historic use of surnames, not only should variants of the spelling of a surname be considered when reviewing various census repositories of information, different surnames should also be considered in specific geographical areas. It is not inconceivable that individuals who were related at specific historical times may have decided to use different surnames when these of surnames became popular.

Illustration Eight indicates variants of the Griffith surname in the 1881 British census. In addition, there are a number of Welsh surnames that are geographically similar to where Griffith(s) surnames were found in 1881. As is evident, the common Welsh surname of Roberts, Owens, Williams, Hughes, Pritchard and Jones are found 80 percent of the time in counties where the Griffith(s) households resides. This is not surprising given the that these surnames were found in most of the Welsh counties.

Illustration Eight: Surname Variant of Griffith and Geographic Similarity of Other Surnames with Griffith

Adding the surname variants of Griffithes, Griffits and Grifiths to the analysis underscores the concentration of households with similar surnames found in Wales and the adjoining counties of Herefordshire and Shopshire in England.

Illustration Nine: Census Prevalence of Variants of Griffiths Surnames in England and Ireland, Mid to late 1800s

Thus far we have observed that the Griffith(s) surname is prevalent in many of the counties in England, Wales and Ireland. There is, however, a relatively higher concentration of Griffith(s) households in all the counties in Wales compared with English and Irish counties. At the latter part of the 1800’s we know that four counties in Wales represented over 60 percent of Griffith(s) households in Wales. Three of the four counties are on the southern border on the Bristol Channel.

Y-DNA & Geographic Location: Crossing the Channel

The comparison of surnames and Y-DNA can show both expected parallels and some surprising differences especially in the “lineage” period of ancestry (see Illustration Ten). This is an era or time period where groups of people have settled in local geographical areas prior to the use of surnames or written history.

Illustration Ten: Three Periods of Ancestry

Correlating data associated with the Y-DNA line of descent with the geographic location of the Y-DNA SNPs may provide a plausible but rough depiction of when and where the Griff(is)(es)(ith) family Y-DNA genetic line migrated to the British Isle and specifically to areas that are now modern day Wales. The relative mutation rate for an SNP is extremely low. This makes them ideal for documenting or marking and tracing the history of genetic mutations in the human genetic tree (haplotree) over long periods of time. Many generations can pass without a SNP occurring. This means that SNPs that occur in a specific lineage are unique and seldom change back. They occur thousands or tens of thousands of years ago.

The analysis of Y-STR data may also shed light on different surnames that are associated with common ancestors within the last 50 generations. As stated in earlier stories about STRs and SNPs, using both SNPs and STRs potentially provide more specificity in tracing the patrilineal line from deep ancestry, through the middle era of lineages and into the more recent historical era of surnames and traditional genealogy. STR markers will generally mutate more frequently than SNPs. SNP testing is getting better all the time and the advanced tests can now find SNPs every two or three generations, but STRs still mutate faster than that so sometimes you will have branches of the haplotree where no SNP mutations have been identified over a time period and you can not easily determine branching if you do not have the SNP branching points to navigate. STRs can show you where mutations have occurred which are more frequent than SNPs and they can mark branches that are not otherwise identified by SNPs. So you can get a little more granularity out of STR testing.

As indicated in other stories on this blog, the Griff(is)(es)(ith) patrilineal line is part of the Y-DNA G-haplogroup. Using an interactive on-line program called “STR Tracker”, an illustrated map chronicles the possible historical migratory path of the family surname haplogroup lineage. [25] This can be used as a basis for evaluating when the Y-DNA genetic line of my patrilineal line possibly migrated to the British Isle.

STR Tracker shows a walking man icon traversing the migratory path of either your paternal or maternal ancestors. Selected major events and cultures appear as the walking man traverses the continent. The app allows you to select various parameters to add information to the migratory path. [26]

Entering my ‘terminal STR’, BY211678, in the app will produce a suggested migratory path to the terminal SNP based on the major SNPs associated with the haplogroup mutations [27]. The terminal SNP is genetically akin to a leaf on small twig (a recent haplogroup branch) on an ancestral tree composed of branches, limbs, twigs and leaves. that was confirmed by my Y-DNA test.

I have recorded a video of the animated path that illustrates the paternal migration time line for the Griff(is)(es)(ith) family Y-DNA. While the accuracy or reliability of the statistical results of such an illustration are fraught with possible sources of error, Spencer, the creator of the app, does an amazing job at bringing historical and DNA data to life. [28]

The historical path generated from this program is probably not the actual path of the ancestors of the Griff(is)(es)(ith) patrilineal line but it captures the time period and general location of each successive genetic SNP mutation that occurred along the paternal lineage.

For a larger rendition of the video click here (recommended) and then click on the video arrow for the animation to start the migration process.

Video: Historical Path of the Griff(is)(es)(ith) Paternal Line

The population of Western Europe has been shaped by various migratory paths of major haplogroups from the east through time. As indicated in Part Three of my DNA story, three major movements of people, shaped the course of European prehistory. While each of these 3 waves of migration were composed of a mix of genetic haplotypes, each were represented by one or two major genetic haplogroups.

The second wave is associated with the migration of Neolithic farmers from the Anatola region. The G-Haplogroup, which the Griff(is)(es)(ith) patrilineal line is a genetic member, was a predominate haplogroup associated with this second wave. They brought not only their DNA but sheep, cattle and wheat to Europe. Within a thousand years the “Neolithic revolution” spread north through Anatolia and into southeastern Europe. By about 6,000 years ago, there were farmers and herders all across Europe.

The third wave, which is predominantly represented by the Yamnaya and are part of the R-Haplogroup, emanated from the Steppes. Illustration eleven depicts three paths of my haplogroup and two R haplogroups. As indicated in the map, the migratory paths of the two R haplogroups moved relatively quickly aacorss continental Europe and into the British Isles. My specific genetic Y-DNA line , part of the G-haplogroup, arrived in the north-central area of continental Europe and stayed there for a longer period of time.

Illustration Eleven: Migratory Paths of G and R Haplogroup Branches

Source: Rob Spencer, SNP Tracker | **Click for Larger View**

The different timing between the migratory paths of the “second wave” G haplogroup and the “third wave” R haplogroups can be viewed in illustration twelve. It appears the the migratory path of the Griff(is)(es)(ith) genetic line crossed the English channel around the Medieval Era. Prior to this time, they coexisted with a mix of other major haplogroup lines (I, J, R, etc).

Illustration Twelve: Migration Paths of G and R Haplogroups into England by Time and Place

Illustration Thirteen below shows longitude versus time to help visualize the migratory path associated with the Griff(is)(es)(ith) patrilineal line. The colors and thick solid/dashed lines are the same as the map above, and the thin horizontal dotted lines show south-to-north lines at notable longitudes. I have highlighted an area on the chart that suggested a possible time period where an ancestor crossed from the European continent to the British Island.

Illustration Thirteen : Westward Migration of Ancestors of Haplogroup G-BY211678

Source: Rob Spencer, **SNP Tracker** for G-BY611678 | **Click for Larger View.**

The following Illustration (Illustration Fourteen) depicts the SNP Y-DNA mutation lines of descent from the G-L497 branch of the G-haplogroup to my terminal SNP branch. The illustration indicates the approximate dates of the man who is the Most Recent Common Ancestor (tMRCA) associated with each of these specific SNP branches. By viewing the approximate dates of each of the MRCAs for each of the branches, we can vaguely estimate when a Y-DNA ancestor possibly crossed from the European continent to the British Isles.

Illustration Fourteen: Estimating When tMRCA Crossed the English Channel

Source: Estimates for MRCA birth and confidence ranges are from Rob Spencer, SNP Tracker |. **Click for Larger View.**

It should be noted that the statistical confidence levels for the birth dates for each of these MRCA’s are pretty wide! The dates are estimates based on genetic information only. Based on a 95% confidence level, the possible range of birth dates are provided in bold. For example, with a 95% probability, the MRCA of all members of the haplogroup G-Z40857 was born between the years 761 and 1198 CE. The most likely estimate is 1000 CE, rounded to the nearest 100. The chart below indicates a confidence level range of 770 – 1210 CE for the ancestor of G-Z40857. The confidence ranges in the chart are a bit different from FTDNA estimates and are provided through the SNP Tracker application. [29]

It is likely that the most recent common ancestor who crossed the English Channel was the ancestor born at the earliest 700 CE (G-Z6748), or 750 CE (G-Y38335) or the latest around 1000 CE (G-Z40857). Given the statistical ranges associated with each of these three individuals, the ancestor could have crossed between 450 CE and 1200 CE.

The following illustration is a still photograph from the SNP Tracker video that focuses on the approximate location of various SNP mutations that suggest an approximate time when the Griff(is)(es)(ith) lineage crossed the English Channel to the British Isle.

Illustration Fifteen: Estimated Migration Path of the BY211678 Haplogroup

It would appear that the Y-DNA haplogroups of the Griff(is)(es)(ith) line lived in Northern Europe, what is now Germany, for thousands of years, roughly 4000 BCE to 700 CE. During this time, males who were part of this Y-DNA line migrated westward and northward toward the northern European coast. Based on FTDNA test kits who can trace their Y-DNA to the G-Z6748 haplogroup, there is one Y-DNA tester, who reportedly can trace his paternal ancestor back to a Tÿgge Jörgensen who was born in 1678 and died in 1730 and lived in Øbjerg, Denmark. [30]

It appears that the MRCA of the G-Z6748 haplogroup was likely born on the European continent. Some of his descendants migrated to the British Isles. The most likely common genetic ancestor who crossed the English Channel is the MRCA of G-Y38335, born around 750 CE but could have been born around the end o the Roman Empire or as late as before the Norman Invasion.

As Spencer indicates:

Many of the haplogroups [that are claimed to] have originated in the British Isles are simply there because they show up as a handful of cases in Britain or Ireland and we have no evidence of their existence elsewhere due to this [Y-DNA testing] bias. Unless a haplogroup has a very unique geographical distribution or is wholly found in continental Europe (a lot of haplogroups do fit these criteria), it takes several hundred testers to accurately place its origin at the level of individual countries. [31]

The logic behind linking Y-DNA SNP branching and the geographical location with FTDNA test results is intuitive but as Spencer suggests, it has a number of limitations and caveats. One notable caveat is the number of FTDNA testers in each of the descending G-haplogroup branches rapidly declines (see Table Two). SNPs with Irish and Scottish origins are generally better represented in the FTDNA database than those with English and Welsh origins. The G-haplogroup, compared to the R-haplogroup, is a present day minority haplogroup and have few Y-DNA testers.

Table Two: Griff(is)(es)(ith) Y-DNA Lineage on the Family Tree DNA (FTDNA) Haplotree and Number of Testers in Each Branch

FTDNA Y Branch Subclade	MRCA Age Estimate	Number of Tested Big Y DNA Descendants in FTDNA Database 01-14-22
G-L497	5300 BCE	1,762
G-CTS9737	4400 BCE	1,647
G-Z1817	3000 BCE	1,590
G-Z727	2450 BCE	1,479
G-FGC477	2100 BCE	117
G-Z6748	700 CE	52
G-Y38335	750 CE	46
G-Z40857	1000 CE	44
G-Y132505	1250 CE	10
G-BY211678	1500 CE	8

Source: Family Tree DNA, Data March 2022

As reflected in Table Two, there are only 52 FTDNA Y-DNA test results for men affiliated with the G-Z6748 Haplogroup. This and the subsequent haplogroups descending from this branch are genetic ancestors that lived on the British island.

Y-DNA & Welsh Origin

There are a few STR markers that suggest the Griff(is)es)(ith) genetic line is Welsh. Haplogroup G-P303 (G2a2b2a) is a branch of haplogroup G (M201) that is a few branches pror to the G-L497 branch (see the chart in footnote 27). This older haplogroup represents the majority of haplogroup G men in most areas of Europe west of Russia and the Black Sea. There are also some short tandem repeat (STR) findings among G-P303 men which help in subgrouping them.

The percentage of haplogroup G among available samples from Wales is overwhelmingly G-P303. Such a high percentage is not found in nearby England, Scotland or Ireland. The STR Marker DYS594=12 subgroup has an unusually high percentage of Welsh surnames with the rest mostly of English ancestry based on available samples. (Red highlighted in Table Three).

Many of the men have an unusual value of 13 for Y-STR marker DYS388 ( I also have a 13 value for this marker which is yellow highlighted in Table Three), and some also have 9 at DYS568 (my value is 11). STR marker oddities are often different in each G-P303 subgroup, and characteristic marker values can vary by subgroup. Often the values of STR markers DYS391, DYS392 and DYS393, are respectively 10, 11 and 14 or some slight variation on these for all G-P303 men (all of these values of these markers I also have which are highlighted in blue in Table Three). [32]

In addition the DYS594 STR marker + 12 is a subgroup that has an unusually high percentage of Welsh surnames and to a lesser number of English ancestry. My value for this marker is 11.

Table 3 : FTDNA Y-111 STR Test Results for James Griffis – Markers 1 – 60

Source: FTDNA Y-DNA Results for Y-111 STR Test | **Click for Larger View.**

Spencer’s Britain and Ireland SNP and Surname Mapper tool provides hints about where and when paternal ancestors lived but is not definitive. Based on a ‘quality control analysis’ of his SNP and Surname Tool, he found that the average error in SNP location is about 160 kilometers. While a surname may have been prevalent in a specific county, an ancestor could have lived somewhere else. Names such as Jones, Williams and Smith have a very high prevalence in Wales. This natural bias may suggest the location of Welsh ancestry where there is none. [33]

The following illustration indicates the locations of FTDNA testers that are part of the G-Z4087 haplogroup, which is one of the earlier Y-DNA ancestor branches of the Griff(is)(es)(ith) line. As reflected in the map most of the testers, on the basis of surnames, can be linked to Wales.

Illustration Sixteen: Location Ancestors for Y-DNA FTDNA Testers Who are Descendants G-Z40857

Source: Generated using the **Britain and Ireland SNP and Surname Mapper** by Rob Spencer | Click for Larger View.

Similar to the results for the G-Z40857 branch, a more recent branch, associated with the Williams surname, is clearly identified with Welsh counties. G-Y132505’s paternal line was formed when it branched off from the ancestor G-Z40857 around 1000 CE. The man who is the most recent common ancestor of this line is estimated to have been born around 1200 CE. [34]

Illustration Seventeen: Location of Reported Ancestors for Y-DNA FTDNA Testers Who are Descendants of the MRCA Y132505

Source: Rob Spencer Britain and Ireland Surname Mapper | **Click for Larger View**.

Family Tree DNA (FTDNA) Y-DNA datasets include the surname of the modern DNA testers. Most of the DNA testers also provide the name of the earliest known paternal ancestor. Some of the tests provide the location of their earliest known ancestor. Despite the small number of Y-DNA test kits that are from the G-Haplgroup, all of this information can be useful in isolating possible areas where the Griff(is)(es)(ith) parilineal line of descent originated.

All surname groups are made up of distinct Y-DNA lineages. Some of those lineages have common ancestry that predates surnames and can reveal Iron and Roman era genetic relationships. Analyzing surnames of Y-DNA testers in the context of SNP and STR markers can create correlations of surnames with geographical areas. [35]

Since the Welsh were late in the game in adopting surnames, finding Y-DNA genetic matches with test kits associated with different surnames may simply indicate common ancestry. Various genealogists have indicated different time periods when the use of surnames arose in Europe. Some have claimed that surnames emerge 25-30 generations ago. While this might be the case for English and possibly other areas in Europe, I would venture to qualify this rule when dealing with Welsh descendants. I would expect common surnames to emerge among Welsh descendants between 12 to 6 generations. Y-DNA matches of test kits that share a Most Common Recent Ancestor (MCRA) prior to this are related but their respective lineages may assume different surnames during the time period where patronymic name sharing practices fell into disuse. [36] A different surname connecting less than 6 generations ago may indicate an NPE. [37] A different name connecting more than 12 generations ago simply indicates common ancestry

Results from the FTDNA L-497 Haplogroup Project

The following Dendrogram is from my earlier analysis of test kits from the L497 Haplogroup Project when I discovered a genetic match with Henry Griffith. The Dendrogram shows my test kit and the test kit of Henry Griffith (different surname) highlighted in blue. Our MRCA is William Griffis, born 1736. The dendrogram estimated William Griffis’ birth about 8 generations from the present (~1691 CE) which was pretty close. What is notable in the dendrogram is the number of different Welsh surnames that are genetically related to both of us: Williams, Gough, Jones. The dates on the dendrogram refer to the approximate dates of birth for the men who are the MRCA for each of the intersections of the graph. Also we are related to a William Jones reported to have been born 1782 in Lanelii, Wales. Our MCRA was born around 1493 CE.

Illustration Eighteen : Dendrogram Linking James Griffis and Henry Griffith

Five of the test kits in the FTDNA L497 Haplogroup Project that are part of my subclade subbranches report that their respective paternal ancestors were born in Wales. One test indicates their paternal ancestor Thomas Thomas was born in 1830 in LLantrisant, Glamorgan. Llantrisant is a town in the county borough of Rhondda Cynon Taf, within the historic county boundaries of Glamorgan, Wales, lying on the River Ely and the Afon Clun.

The other set kit indicates their paternal ancestor, William Rhydderch, was born before 1796 in Swansea, Wales. Swansea, Welsh Abertawe) is a , city, Swansea county, historic county of Glamorgan (Morgannwg), southwestern Wales. It lies along the Bristol Channel at the mouth of the River Tawe.

Another test kit indicates that their paternal ancestor was from Broxton, England. Broxton is a village and civil parish in the unitary authority of Cheshire West and Chester and the ceremonial county of Cheshire, England. The village is 11 miles south of Chester, and only 10 miles east of Wrexham in Wales.

Illustration Nineteen: Reported Location of Paternal Ancestor Filtered for G-Z6748 Haplogroup Y-DNA Testers

**Click for Larger View** **| PDF is also Available for better viewing**

Results from the FTDNA Wales Cymru Y-DNA Project

Another FTDNA work group that I am a member is the Wales Cymru Y-DNA Project. This work group project is designed to establish links between various families of Welsh origin with patronymic style surnames. Because the patronymic system continued until the 19th century in some parts of Wales, the project does not limit their study to single surnames. A Williams, for example, could just as easily be related to a Jones, Evans, or Roberts as another Williams in the direct male line. This work group, at the time that this story was written, had 1,598 members. Most of the members are part of the E, I, J and R-haplogroups. These haplogroups are predominate Y-DNA haplogroups in the British Isles. The number of test kits within the G-haplogroup that is part of this Y-DNA work group is small. There are 20 test kits representing the G-Haplogroup in this work group.

Isolating test kits from the G-Haplgroup was relatively easy since most of them had haplogroup paths that included the G-P303 branch which I referenced earlier in the story.

Illustration Twenty: Haplogroup Paths for G Haplogroup kits in the Wales Cymru Y-DNA Project

I created a dendrogram of the 20 test kits that were part of the G-Haplogroup and eleven were shown to be related, albeit distantly. As indicated in Illustration Twenty One , the MRCA for most of the test kits was born around 635 CE. I share a common ancestor who was born around 1328 CE with six test kits. Five of the six surnames of their respective paternal ancestors are common Welsh surnames: Rees, Evans, Griffiths, and Howard. The sixth test kit has an uncommon Welsh surname of Rhydderch. It is interesting to note that for those paternal ancestors that were born on the British Isle, they were all born in Wales:

Trefeglwys: Trefeglwys is a village and community in Powys, Wales, within the historic county of Montgomeryshire. The name derives from the Welsh language tref ‘township’ and eglwys ‘church’. The village sits on the Afon Trannon.
Carmarthenshire: Carmarthenshire is a coastal county in the south-west of Wales. The three largest towns are Llanelli, Carmarthen and Ammanford. Carmarthen
Narbeth: Narberth is both a town and a community in Pembrokeshire, Wales.
Harerfordwest: Haverfordwest is the county town of Pembrokeshire, Wales,
Llantrisant: Llantrisant is a town in the county borough of Rhondda Cynon Taf, within the historic county boundaries of Glamorgan, Wales
Swansea: Swansea is a city and county on the south coast of Wales.

Illustration Twenty One : Enlarged View of Dendrogram of Y-DNA Test Kits from Wales Cymru Y-DNA Project

For an integrated view of the dendrogram and information related to the haplgroup branches associated with the G-Haplogroup test kits in the Wales Cymru Y-DNA Project see Illustration Twenty Two.

Illustration Twenty Two: Dendrogram of G-Haplogroup Test Kits in the Wales Cymru Y-DNA Project

Source: Family Tree DNA | **Click for Larger View**

Results from the FTDNA G-Z6748 Project

Finally, the recently formed FTDNA Y-DNA Haplogroup Project for SNP G-Z6748, which is downstream from G-M201 > L89 > P15 >> L497 has provided some interesting results. Through initial research, the G-Z6748 appears to be a largely Welsh haplogroup, though extending into neighboring parts of England and one test kit from Denmark.

The Project Administrator of the group produced an interesting map that shows all known Z6748+ participants (and Y-Matches) who have traced their ancestor to a specific town in Europe. As can be seen below, the majority of the group are tracing their ancestors to coastal southern Wales. Some of the outliers appear to be upstream, so perhaps indicating pre-Wales origins for the group. Further upstream G-L497 is from continental Europe in Bronze Age times, so part of the goal for this group and the L497 work group is to understand the timing of the movement to the UK.

Illustration Twenty Three: Map of Paternal Ancestors of Test Kits in the G-Z6748 Haplgroup Project

The following are the locations of the 18 pinpoints on the map:

Wiggenhall St. Germans, England: Wiggenhall St Germans is a village and civil parish in the English county of Norfolk in the East of England. It is 85 miles north of London and 5 miles south-west of King’s Lynn.Little Marlow, England:
Little Marlow is a village and civil parish in Buckinghamshire, England. Little Marlow is located along the north bank of the River Thames, about a mile east of Marlow.
Broxton, England: Broxton is a village and civil parish in the unitary authority of Cheshire West and Chester and the ceremonial county of Cheshire, England. The village is 11 miles south of Chester, and only 10 miles east of Wrexham in Wales.
Acle, England: Acle is a market town on the River Bure on the Norfolk Broads in Norfolk, located halfway between Norwich and Great Yarmouth. It has the only bridge across the River Bure between Wroxham and Great Yarmouth.
Pontypool, Wales: Pontypool is a town and the administrative centre of the county borough of Torfaen, within the historic boundaries of Monmouthshire in South Wales
Llysworney is a small village in the Vale of Glamorgan, South Wales, in the community of Llandow.
Øbjerg is located in the region of South Denmark. South Denmark’s capital Vejle (Vejle) is approximately 74 km / 46 mi away from Objerg (as the crow flies).
Rotherfield, England: Rotherfield is a village and civil parish in the Wealden District of East Sussex, England. It is one of the largest parishes in East Sussex. There are three villages in the parish: Rotherfield, Mark Cross and Eridge. Rotherfield was originally a Saxon settlement in an area generally covered with oak forest.
Haverfordwest, Wales is the county town of Pembrokeshire, Wales
Kent, England is a county in South East England on the coast across from Calais France
Llanelli is a market town and the largest community in Carmarthenshire and the preserved county of Dyfed, Wales. It is located on the Loughor estuary 10.5 miles (16.9 km) north-west of Swansea and 12 miles (19 km) south-east of the county town, Carmarthen. Early recorded place names in the Bristol area include the Roman-era British Celtic Abona (derived from the name of the Avon) and the archaic Welsh Caer Odor.
Narberth is a town and in Pembrokeshire, Wales.
Swansea is a coastal city of southern Wales. the city is located along Swansea Bay in southwest Wales, part of the historic county of Glamorgan
Glamorgan or sometimes Glamorganshire is one of the thirteen historic counties of Wales.
Bristol, England Situated on the River Avon, it is bordered by the ceremonial counties of Gloucestershire to the north and Somerset to the south.
Glamorgan or sometimes Glamorganshire is one of the thirteen historic counties of Wales.
Port Talbot is a town and community in the county borough of Neath Port Talbot, Wales, situated on the east side of Swansea Bay, approximately eight miles from Swansea.
Pencoed (Welsh: Pen-coed) is a town and community in the county borough of Bridgend, Wales. It straddles the M4 motorway north east of Bridgend and is situated on the Ewenny River.

Conclusion

The overlapping of facts from the various FTDNA Y-DNA research groups are coming up with interesting results that strongly suggest the Griff(is)(es)(ith) paternal genetic line of ancestors came from Wales.

Back to the duck test of abductive reasoning, I believe the Griff(is)(es)(ith) surnames related to the family that started its colonial beginnings in Huntington, New York are indeed of Welsh origin.

Sources

The feature image at the tope of the story is an amalgam of maps and statistics on the distribution and prevalence of the Griff(ith)(ith) surname in Ireland and England.

[1] William Case Griffis was the grandson of William Griffis. His grandfather, William Griffis, who was the son of William Griffis, fought in the revolutionary war, William Case Griffis (Born 14 June 1825 in Chatrham, Ontario, Canada and died 27 July 1902 in Beaver Dam, Wisconsin) wrote the following notes in his father’s journal after his father’s death. His father was Reverend William Griffis.

“My Great Grandfather, on my father’s side came from Wales and settled in Huntington, Long Island. They spelled the name Griffiths. My Grandfather, who died at my Father’s house could never give me any reason why he changed it to Griffis. He moved to Canada and settled at Adolphustown where my father was born, also three brothers of my father, Phillip, Stephen and Gilbert and one sister who married a Mr. Harris. My father’s mother, Content Harris, was born in England. I have my grandfather’s old pension certificate for the services in the Rev. War. He had to go to Albany for his pension.”

The quote is from Mary Martha Ryan Jones and Capitola Griffis Welch, compiled by, Griffis Sr of Huntington Long Island and Fredericksburg, Canada 1763-1847 and William Griffis Jr, (Reverend William Griffis) 1797-1878 and his descendants. A self published genealogical manuscript, 1969. Page 103.

[2] John and Sheila Rowlands, The Use of Surnames, Chapter 4, Patronymic Naming – A Survey in Transition, Llandysul, Ceredigion: Gomer Press, 2013,

The chart below reflects the variations in spelling in the family surname among William’s 12 children.

Based on my assessment of genealogical evidence, seven of the children used the ‘Griffis’ surname, three used the ‘Griffith’ surname and one used the ‘Griffes’ surname.

The children of William Griffis with variations of surname spelling — **Click for larger view**.

The third generation of the family reflects a continuation of various spellings of the surname:

The descendants of William’s second child, James Griffis, reverted back to the ‘Griffith’ surname.
The descendants of the third son, William Griffis, used both Griffis and Griffith. Three of his four sons used ‘Griffis’ while a fourth son used ‘Griffith’.
The fifth son, Stephen Griffis, appeared to have used or was recorded as a Griffith and Griffis but it is not entirely certain what he actually used as a last name.
Nathaniel Griffes, the sixth son, was the only child that spelled his name as an adult with an ‘es’ on then, Griffes. His descendants continued the tradition.
While it is not entirely certain, Joel Griffith probably spelled his name with a ‘th’ on the end.
Little is known of the second daughter of William, Esther Griffis, but she probably spelled her last name with an ‘-is’.
Epenetus and John used Griffith and Daniel and Jeremiah used Griffis.

[3] In 1700, 80 percent of the British colonists were English and Welsh, in 1755, the figure was 52 percent and by 1775, it was 49 percent. Thirteen Colonies, Wikipedia, This page was last edited on 3 January 2022, it was accessed on 21 Jan 2022.

Simon Newton Dexter North, A Century of Population Growth from the First Census of the United States to the Twelfth, 1790- 1900, U.S.: Bureau of the Census, 1909

[4] W.T.R.Pryce, Migration: Concepts, Patterns and Processes, in John & Shiela Rolands, Welsh Family History: A Guide to Research, Second Edition, Baltimore: Genealogical Publishing Company, 1998, page 248

[5] R. Hargreaves-Mawdsley, Bristol and America: A Record of the First Settlers in the Colonies of North America 1654- 1685, Clearfield 1929, page 3

[6] David Peate, Emigration , in John & Shiela Rolands, Welsh Family History: A Guide to Research, Second Edition, Baltimore: Genealogical Publishing Company, 1998, page 260-261.

[7] Ibid.

[8] Duck test, Wikipedia, This page was last edited on 13 Feb 2023, https://en.wikipedia.org/wiki/Duck_test

[9] Portrait of William Case Griffis by Pastel artist Deborah Phillips Griffis, sister in law of William Case Griffis. (born 1825 • Liverpool, Nova Scotia, Canada and died 20 Nov 1903 • Chicago, IL). pastel is 13 by 18 inches. The owner of the Pastel is Mrs. John Carlson, North Fargo ND. The information was compiled as part of the Smithsonian American Art Museum’s inventory of American Paintings. Susan Montagne originally shared this image 13 Apr 2013 on Ancestry.com

[10] During the period of transition from the Welsh patronymic system to the use of formal surnames, in addition to the influence of using English based names, native Welsh names also were influenced by different adaptations.

the incorporation of the word ap (‘son of’) into the name, e.g. Thomas ap Howell became Thomas Powell;
the dropping of the use of ap, e.g. Thomas ap Howell became Thomas Howell
the addition of a possessive ‘s’ to a surname: e.g. Griffith became Griffiths
the preference for using Old Testament given names within the older nonconformist denominations;
the survival of old Welsh names in specific geographical areas; and
the migration of people into Wales from areas with different surname structures (e.g. Scotland, England and Ireland).

John Rowlands, The Homes of Surnames in Wales, in John and Shiela Rowlands, ed, Stages in Researching Welsh Ancestry. Bury, England: The Federation of Family History Societies Publications Ltd., 1999. Pages 164 – 170.

Happy Pi Day!

Pi Day is an annual celebration of the mathematical constant π. Pi Day is observed on March 14 since 3, 1, and 4 are the first three significant figures of π. Pi day was founded in 1988 by Larry Shaw, an employee of the San Francisco, California science museum, the Exploratorium. [1]

My contribution on Pi day is constructing a circular distance dendrogram of Y-DNA ancestors. Your immediate reaction probably is,

“Well Jim that’s great! It is circular but what am I looking at?!”

This is a fair question.

The “Pi” chart was constructed using an innovative program by Rob Spencer. [2] A distance dendrogram is a software-generated diagram that conveys relationships between Y-DNA test kits based on distance measured in years or generations. In this instance, distance is measured in generations .

What you are looking at is a circular rendition of comparing the relative closeness, measured in generations, of Y-DNA test kits with my Y-DNA test kit. It is a circular rendition of a chart that illustrates individuals who are genetically related based on Y-DNA SNP and STR test results.

Clear as mud, right? Let’s not get into STR and SNP Y-DNA tests and what do they measure. This is Pi day so let’s stick to the circle!

The outer perimeter of the circle has nodes that represent various Y-DNA test kits. My test kit is highlighted (around eleven o-clock). Each node is labeled with the earliest known paternal ancestor noted by the individual who took the Y-DNA test. So in my case, it lists “William Griffis born 1736”. He is the last known paternal ancestor of the Griff(is)(es)(ith) family that started in Huntington, New York.

The inner circles on the chart represent time in terms of generations. Time (the number of generations) moves toward the center of the circle. The lines connecting various nodes (test kits) and branching to other lines as one goes backward in time are similar to the lines one finds in a family tree. However, the connections of the lines represent the most recent common ancestor between the network of lines linked earlier in time.

Dendrograms are close cousins (pardon the pun) to family trees — but with a few important differences. The relationships are expressed by the distances not by relationships (family trees depict family relations like father, sister, cousin etc). Because we use a linear and additive measurement of distance (i.e. time), the dendrogram has a time scale (either years or generations). Instead of lines to various family individuals, as indicated, the dendrogram has lines that connect to tMRCAs (time to the most recent common ancestor).

One key difference between a dendrogram and a family tree is that a dendrogram defines only the “leaf nodes” of the family tree. A dendrogram does not “know” that there are other dots on the diagram; the joining-points are a mathematical construct. Yes, in the limit of perfect distance data, every joining-point (T junction) corresponds to a specific ancestor. But the construction of the diagram alone does not put ancestors on the tree.

One important property of a distance dendrogram is that if the input distances are accurate and consistent, then the graphic will completely and correctly represent a family tree. If we had a set of people who had completed DNA tests and if we could calculate the tMRCAs for all pairs with complete accuracy, then their dendrogram would be an accurate family tree. The connecting points with the lines would represent people. Since we don’t have DNA test results for everyone, the connecting points on the line diagrams in the circle represent genetic estimates of when a common genetic ancestor was born.

The scale of the data and graphics can reveal large scale, high-level patterns of when one person became the descendant of all others and other demographic patterns that are not apparent using other methods of presenting DNA test results.

You can demonstrate the relationship between dendrograms and family trees for yourself with the Distance Tree Introduction interactive tool, and also for larger and more realistic family trees with the Family Simulator, both created by Rob Spencer.

If we were to focus on my test kit, one can see that a test kit that has a “William D Walters” as a paternal ancestor is next to mine and the diagram ‘links’ our kits right around the second outermost circle (10 generations). What is means is that our “most recent common ancestor” (MRCA for short) was born about ten generations ago. Which translates to around 1625 CE. [3]

I guess I need to look at possible genetic family members with the name of Walters….as well as Lewis, Williams, Howard, Reese.

One may immediately ask the question, “Wait a minute your last name is Griffis, how could you be related to a guy named Walters? ”

That’s another good question. But without digressing from this important day of Pi, it has something to do with that fact that the Welsh were a bit slow in picking up the use of using surnames.

The practice of using surnames in Wales happened at different times in various parts of Wales. In fact it was not until the late 1700’s that the old practice of patronymic naming was replaced with the modern practice of using surnames. [4] So, it is technically possible, from a genetic standpoint, that our family is related via Y-DNA lineages with different names.

We can transform this pi circular chart into a linear chart as illustrated below:

Personally, I like the linear charts, they are easier to read for me. Which dendrogram depiction is more intuitive is a matter of personal preference. I imagine it also depends on the nature of the data whether the Pi charts are better at providing a better graphic depiction of genetic relationships between test kits.

Circular or linear, Distance dendrograms of Y-DNA ancestors provide intuitive graphic renditions of genetic analyses of lineages The comparison of surnames and Y-DNA can show both expected parallels and some surprising differences especially in the transitional “Lineage” period of Y-DNA prior to the use of surnames (see Illustration below). This is an era or time period where groups of people settled in local geographical areas after large-scale migrations prior to the use of surnames or written history. An analysis of Y-SNP and Y-STR data may pinpoint an area where the most recent haplogroups of the Griff(is)(es)(ith) patrilineal line originated, regardless of surname.

Illustration: Three Periods of Ancestry

Happy Pi day !

Sources

[1] Pi Day, Wikipedia, This page was last edited on 14 March 2023, https://en.wikipedia.org/wiki/Pi_Day

[2] Rob Spencer, Y STR Clustering and Dendrogram Drawing, Tracking Back: a website for genetic genealogy tools, experimentation, and discussion, http://scaledinnovation.com/gg/clustering.html

The data was from:

Family Tree DNA L-497 Project, DNA Results, https://www.familytreedna.com/groups/g-ydna/about

The G-L497 project includes men with the L497 SNP mutation or reliably predicted to be G-L497+ on the basis of certain STR marker values. The L-497 is a branch or subclade of the G-haplogroup (M201+). The project also welcomes representatives of L497 males who are deceased, unavailable or otherwise unable to join, including females as their representatives and custodians of their Y-DNA. The primary goal of the project is to identify new subgroups of haplogroup G-L497 which will provide better focus to the migration history of our haplogroup G-L497 ancestors. (2,326 members as of the date of this article.)

[3] Generations is calculated as follows:

One generation = 33 years
Years before present is based on the year 1950

The natural unit of Y STR date analysis is generations-before-present. To turn that into calendar years we must have a base-year, years before present (YBP) and a value for male years-per-generation. Based on a review of the literature of this subject, many folks have been using 1950 as a base year (it is the traditional base-year for radiocarbon dating). More recently, a number individuals have used 1957 as base for YBP since is reflected the demographic average of current Y-DNA testers (baby boomers). I ended up using 1955, a compromise between the traditional ‘radio carbon’ date and the ‘baby boom’ date.

Male years per generation shifted, depending on a given author of a study, from 30 years to 33 years. I am following Rob Spencer’s lead and using 33 years equal to a generation.

Rob Spencer, Revisiting the Length of a Generation, Tracking Back: a website for genetic genealogy tools, experimentation, and discussion, http://scaledinnovation.com/gg/gg.html?rr=strByMu

So, for our example of 10 generations:

10 (generations) x 33 (years) = 330 years
1955 (‘present” year) – 330 = 1625

[4] Before the 1536 Act of Union, the Welsh did not generally employ surnames, but instead used epithets (e.g. Selyf Sarffgadau, “Selyf the Battle-Serpent”), patronyms (e.g. Rhodri ap Merfyn, “Rhodri son of Merfyn”), and (much less often) matronyms (e.g. Rhodri map Nest, “Rhodri son of Nest”) to identify people.

Map: Patronymic Decay and the Rise of Surnames in Wales

The map above, which is from their study, reveals the wide variation when surnames were adopted in various parts of Wales. Surnames became the norm by 1750 across the coastal plain of south Wales and along the eastern border with England.

Source: John and Sheila Rowlands, The Use of Surnames, Chapter 4, Patronymic Naming – A survey in Transition, Llandysul, Ceredigion: Gomer Press, 2013, Pages 50-57