Oooh, fascinating! :D
I do know there was a constant changing of principality borders due to unrest or political maneuvering. Add to that mix the surname changes, and many surname hyphenations.
If he belonged to one of the noble houses, though, there are certainly lists & wiki pages which list many of the members of those houses.
You never know your luck.. :)
Already scoured much of the internet for that, no luck. Everything about his life in Germany is a mystery. It is possible that he changed his last name however.