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Ireland has one of the oldest systems of patri- lineal hereditary surnames in the world. Using the paternal co-inheritance of Y-chromosome DNA and Irish surnames, we examined the extent to which modern surname groups share a common male-line ancestor and the general applicability of Y-chromosomes in uncov- ering surname origins and histories. DNA samples were collected from 1,125 men, bearing 43 different surnames, and each was genotyped for 17 Y-chromosome short tandem repeat (STR) loci.

The Surnames of Ireland Map | Irish Origenes: Use Family Tree DNA to Discover Your Genetic Origins | Clans of Ireland | Irish Surnames Map