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The dominant Y-haplogroup in Ireland is R1b-L21. L21 is ancient in Ireland; but around 100 B.C. underwent a dramatic bottleneck "so large as to resemble a population recovery from some kind of disaster in which the Irish population was nearly wiped out."https://www.academia.edu/24686284/The_phylogenealogy_of_R-%09L21_four_and_a_half_millennia_of_expansion_and_redistribution …
Population genetics has a way of enhancing the reputation of linguists, because they predicted just such a bottleneck. When Irish first appears on ogham stones it has no dialectical variation at all, suggestive of a recent expansion. This is from Peter Schrijver.pic.twitter.com/LfUXjcuGzc
One possibility that most men died off in the Irish Dark Age, the other is that the Irish are actually very, very recent migrants out of Britain. The Celtic linguist Schrijver suggests that Irish and Brythonic are so closely related that they only split around the 1st century AD:pic.twitter.com/1YGK7kjy6B
This implicitly supports Ian Adamson's Cruthin hypothesis, I feel. That Cruthin is the Q-Celtic version of Briton, showing a close link between the two populations, and that the Celtic populations of the British Isles are thus more closely connected than we think.
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