Playing the old pit the Celts and Germans against each other game? Mixed European descent usually amounts to the same group. Celt and Germanic are linguistic categories and both groups arose in an overlapping range from Indo-European tribes and some Old Europeans. The cultural and racial differences are few. A mixed Khoisan and Bantu(unrelated groups) in South Africa has more “difference” in their ancestral lines historically, linguistically, and racially, than an Irish-Scottish mixture(related groups). Most of the peoples of Europe are descended from similar groups overrunning each other in waves. Britain is a great example of that; the Scots are mostly Gaels from Ireland with a Norse/Norman component and Pictish further back. The English are Britons overlaid with West Germanic(like the Dutch today) tribes and a Norse/Norman component. This just repeats all over the isles, with the main differences being more or less Anglicization and French Norman influence. So it depends on “how mixed?” German-French, or something like Scottish-Sardinian? The latter is more realistic to consider mixed at least. If it is in the broad area of northern Europe, this is pointless. Beowulf is an Old English story about events in Denmark with a hero from Sweden, for example. They knew there was a connection between them(Anglo-Saxons) and those other peoples. They were still singing of the great victory of the Gothic led Germanic alliance against the Huns in the 5th century in medieval England. Whenever someone gives me this nonsense about mixed European groups, I think they are being disingenuous to push their agenda against Europeans.