Click here to download our 2018-12-01 tree for I-Y11222
Irish men belong to many different branches of I-M26, but probably the biggest branch that is largely confined to Ireland is I-Y15581. This branch has a MRCA of 3800 years ago, according to YFull's calculation. All known members have Irish paternal ancestry, except for one English/Welsh family and one family from Iceland that claims Irish ancestry dating to the settlement of Iceland.
Thanks to a recent Big Y there is a new branch is called I-Y45584, FTDNA calls this branch I-BY151272. The two Big Ys for I-Y45584 share many additional SNPs but they are not very closely related, probably their MRCA lived more than 1000 years ago.
Click here to download our previous tree for I-Y11222
Click here for a brief description of the I-Y11222 haplogroup
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