Have you searched for the name outside your family line? I know you said misspelling but my last name is rare because it was made up by immigration on Ellis Island: they couldn’t understand my ancestor so decided “close enough”. Same thing as a rare misspelling.

Before the internet, we knew of one unrelated person with the same last name but only because he was he was geographically close enough to be in a neighboring phone book. When someone took my Gmail (identical first initial, last name) it was a relative. Now with the internet and person search we’ve found a handful, but only a handful

Whoa super cool! I would ask you to say what it is but do not expect you to answer :)