The R-L371 group's purpose is to advance understanding of this rare Y-DNA Terminal R1b SNP found in males having Welsh ancestry.
This R1b Y-SNP is also known as: R1b1a2a1a1b3a8 at FTDNA; R1b1b2a1a2f* at 23andme; R1b-L371; L371; S300; Y-Position 17165864 (NCBI36); R-17-14-10. The mutation was T>G. R-L371 surnames include: Thomas, Griffith, Jones, Jenkins, Evans, Pugh.
R-L371 had a genesis in NW Wales 1000 years ago and is found now in male descendants living in Wales, England, USA, Australia, Canada, Ireland. R-L371 males descend from upstream / older "R1b" Haplogroups (YBP Years Before Present):
R-M269 / S3 / R1b1a2 ~4800 YBP
R-L11 / S127 ~4500 YBP
R-P312 / S116 ~3700 YBP
R-L21 / S145 ~3600 YBP
R-DF13 / S521 ~3400 YBP
R-L371 / S300 ~1000 YBP
There could be some undiscovered Y-SNPs upstream or downstream of R-L371. About .1% (1 in 1,000) of Y-DNA tested men in the U.S. are R-L371. In certain NW Wales hotspot areas, this percentage could rise to about 1% (10 in 1,000).
The R-L371 "Adam" was likely born in geographically isolated Northwest Wales (perhaps Meirionnydd in Gwynedd county or Anglesey county). This area of NW Wales is also a Welsh homeland for the Griffith and Jones clans.
R-L371 men have a 3 part and rare Y-STR Signature: DYS448=17; DYS456=14; DYS450=10. A "20" at DYS650 is a Griffith Jones indicator.
Take a $199 National Geographic Geno 2.0 DNA test for Y-DNA (incl R-L371), mt-DNA, Autosomal DNA, etc. at Geno 2.0 "L371,Y,C,C" = L371+ If you are R-L371+, please email RL371firstname.lastname@example.org for info.