I don't know if this will help, but have you found people you know are relatives yet they used different spellings? I have that with two surnames. E.g., one family line decided to drop a letter. (And then, of course, some folks had their names changed at Ellis Island and some switched up the name to make it less ethnic or more "American.")
My bio father's name was LaPorte, yet his father was from Sicily and that's from where it seems all my 24% Italian might stem. Ancestry didn't break out the France region (it might have been clumped in with, say, Germanic Europe), so I'm not sure how LaPorte fits with GF's profile. Yet.