Strange--One of the Norse languages helped create Old English, to start with (along with Anglo-Saxon), I thought. Various grammatical features of English are derived from the Vikings who took over central Britain, and against whom Alfred and his successors fought and eventually won.

I have read that the European language closest to modern English is Frisian. I know that when I used to listen to SW radio while I was in the USN, that Radio Nederland used to broadcast at times in a language that sounded like English (but wasn't).
Regerds, Pete