Hopf means "Hops." This was a chosen surname used by a number of Jewish hops merchants, traders, and agricultural bankers in the area around Nuremburg, Germany after the German government required Jews to take Germanic surnames in 1813. Among the people who first took this surname, quite a few were also known by Jewish surnames, such as Levi, or by alternative German-bestowed surnames, such as Mandelbaum which they traded in for the Hopf surname when they were permitted to do so.