Updates to Butler YDNA

I see my last Blog on Butler YDNA was about a year ago.  A little or a lot can happen in a year. Turns out some things have happened.

Three Big Y Testers: 2 Butlers and a Batt

There are three Big Y testers that show that they have a common ancestor in the past 700 years. Here is the simplest way to show how these three are related:

Note that while Batt’s SNP is I-Y238315, I didn’t put Batt in that box. That is because Batt and Butler both descend from I-128315. In other words, Butler does not descend from Batt, but both names descend from a common ancestor. This shows that the three testers have a common ancestor who was born 700 years ago. This also shows that the two Butlers who have tested for the Big Y have a common (likely Butler) ancestor from about 225 years ago. Here is how the YTree shows it:

These are the dates that I didn’t have as of my previous Blog. Previously, we were just up to 700 years ago. This new information thanks to the new Big Y Butler tester brings us 475 years closer to the present date.

However, there is a catch to these dates.


The above trees are based on SNPs. FTDNA also tests for STRs. The STRs show that Batt is more closely related to my late father in law Richard Butler than to the other Butler. So which is right? Whenever there is a conflict between SNPs and STRs, SNPs are always right.

Here is how my father in law Richard matches Batt and the other Butler by STRs:

Based on STRs, it looks like Batt is a closer match than Butler. However, by SNPs my father in law matches Batt 700 years ago and Butler 225 years ago. This is due to the variability of STRs or back mutations. Also the Butler above could have had more STR mutations than usual and/or the 225 year estimate for common Butler ancestors could be on the low side

A New Butler STR Match

I was notified recently that there was a new Bulter 37 STR match. That is good news. Also this Butler has ancestors from County Wexford. Peter, who has been researching Butlers feels that Wexford is a likely origin for the Butlers. Here is my father in law’s match list at the 37 STR level:

The new Butler match at the top is a perfect match with my father in law at the 37 level. However, that could change as more STRs are tested. My guess is that the three Butlers on the list are I-Y128364 and the non-Butlers on the list are not. Also notice that the first two Butlers matching my father in law have Wexford roots.

Here is a partial map of Wexford:

I believe that my father in law’s family came from County Kilkenny just North of Waterford. However the distance from that area to Wexford is not far. At any rate, this new YDNA Butler match seems to suggest that a common Butler ancestor could be from Wexford.

What’s Next?

The new Butler match may want to take an Autosomal DNA test. This could be done at FTDNA or at AncestryDNA. The advantage of AncestryDNA is that they have more people who have taken that test. That means a bigger chance of finding matches. The DNA matches will be looking for genealogical connections. The new match could do further YDNA testing, but that is a bit more expensive than the autosomal DNA test.



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