Is the last name hallison Swedish, Norwegian, or Finnish?

Hmmm...out of those three, I think it'd be closest to Swedish. O's in Norwegian often look like this "�." I'm almost certain it's not Finnish. The thing is though, Swedish last names ending in "son" usually have a double "s." For example, an American might spell the name Anderson with one s. and a Swede would spell it "Andersson."