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.