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You might find higher germanic haplogroups, maybe, but that's about it. The initial norse population was probably really small and it recieved people from various other parishes/counties/regions in the last millenia, if you've done genealogical research you'd know that. Coastal areas - particularly those with any significant economical activities such as fishing - are never going to be totally isolated, especially not for such a long period of time. You're not talking about a random village in the mountains, even if that were the case odds you'd find extreme endogamy were minimal, this isn't a situation like Belmonte Jews (and even here we're talking about a much, much smaller timeframe).
Besides, one sample will tell you nothing because you'd have to account for personal variation. Even if you do happen to stumble upon someone with higher "germanic" ancestry it will not prove anything because it's perfectly plausible he's just another random person who scored higher *whatever* in a certain test, and there are people like that all over the country. My advise is to not waste your money
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