Comment by JuniperMesos

This is accurate if their family ancestry is from the Nordic countries, Britain or Ireland, which is a substantial chunk of Northern Europe (although in the latter cases the heritage looked more like male Viking invaders taking non-Norse wives from among the people they conquered for hundreds of years in the Danelaw or similar).

More broadly, the Norse were among the last people in Europe to be converted to Christianity, and their particular pagan traditions lasted long enough to be recorded and preserved in some form by medieval Christian writers, in a way that was not true of other Germanic peoples who were Christianized much earlier. So there's a sense in which our modern understanding of the pre-Christian Norse worldview is a stand-in for what must've been a more widespread set of European pagan traditions that were wiped out by Christianity. An incomplete and limited stand-in, of course, as any serious scholar of that world will tell you; but it makes sense that modern white people who have an interest in what their own ancient, pagan history might've been like - or for that matter people who have a sincere problem with Western Christianity and are seeking some kind of alternative spirituality - might look to the Norse world with interest, even if their share of genetic heritage from that world is minimal.