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I didn't noticed before, but it seems like the question pronouns in swedish are also cognates with most of the PIE languages (probably via the *kw phoneme):
-vem (sv) -who (en) -quien (es) -кто (ru) Etc
I guess, if this is true, that the kw phoneme became wh in proto-germanic, and then *w>v in old norse? Sorry for not using the phonetic symbols