Maxine, good to have you aBoard!
My guess would be that the spelling was changed to try and
match the English pronunciation.
A Jewish lady I used to work with told me that U.S. Immigration officials years ago (possibly during/after WWII)
had so much difficulty with the Polish, etc., Jewish names, that they began arbitrarily assigning names that were more understandable to them. That's why we have a large number
of Goldsteins, Goldblums, Goldbergs, etc.