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My Y-haplogroup, R-Y4010 (R1b, subclade of R-M269), is a relative rarity in northern Denmark, from where my 4x great-grandfather emigrated in the 1840s. I've confirmed with male-line relations -- two second cousins -- that they share the same haplogroup, and we all have a good enough sense of our genealogy/genomic breakdown to confirm Danish patrilineal origin.
(The family spent two generations in a mostly Danish LDS community in Utah after immigrating, so an Irishman sneaking into the family tree during that period is unlikely).
Is this at all an unusual result for Danish men? I read here that R-Y4010 is an "entirely Irish lineage", and I read somewhere else -- can't find the link -- that it originated around 550 AD in Ireland.
Could my having this haplogroup be explained by Viking Age population exchange between the British Isles and Scandinavia? Or is the ambient level of R-Y4010 in Denmark high enough that it doesn't require any special explanation?
[Edit] For reference, here's a heatmap of R-Y4010:
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