excuse me that I come into your discussion, but the spelling of the Hofmann's name is rather a qustion of the region, where the person lived, than of the religion. There is no jewish, catholique or protestant spelling. If you go to www.verwandte.de
, you will see, that the name Hofmann apears mostly in the southern part of Germany and the name Hoffmann in the northern.
Greetings from Germany