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Welcome to the web-site of the Clan Irwin Surname DNA Study.  This Study was launched in 2005, with the assistance of Kent Irvin, and its website was re-vamped in 2011 and again in 2021, with the assistance of Rick Byers.  For the Menu to this website click on the 3 parallel lines top left.

The Study, its website and its administrators are fully independent from both FamilyTreeDNA and the Clan Irwin Association, although the Study continues to support the Association and to recognize that the interests and memberships of the two entities have considerable overlap.

This May 2025 Update is the 36th update of our Study.  Highlights include:

• Our Study cinues to grow slowly but steadily.   Our results table shows the Y-DNA test results of 649 members, plus another which 15 add perspective but do not qualify for membership.  48 branches of our Surname have been identified, of which our Borders branch is by far the largest.

• 170 (26%) of our members now have BigY test results, which show how testers in each branch are related to one another, and when their common ancestor lived.

• The haplotree of our Borders branch now shows how 61% of our members within this branch are related to one another.  Several of our smaller branches now have simple haplotrees too. 

• $50 supplements for 37-marker STR tests and BigY700 upgrades are still available to Clan Irwin Association members.

As Administrator I am happy at any time to answer e-mail queries members and prospective members, and to forward our Main Results table and/or L555 genetic family tree as e-mail attachments.