Ice Age Refuges, 12,000 Years Ago.
I was told once that Icelanders have more in common with the Celts than the Norse—apparently a lot of the early settlers were from the Hebrides or nearby areas, either bringing Hebridean or Irish women along as slaves/concubines, or being themselves born of local women to Viking men. Of course the Icelandic language is derived from Old Norse. It may be that the Icelandic Y-chromosomes are Scandinavian but the mitochondrial DNA may be more Celtic. Whatever “Celtic” means.
Ice Age Refuges, 12,000 Years Ago.
The ‘Celtic’ yDNA is likely to be R1b and the mtDNA is ‘H’...maybe ‘U5a’. 90% of the Irish have R1b yDNA.