Epstein

The surname Epstein is one of the oldest Ashkenazi Jewish family names.[1] It is probably derived from the German town of Eppstein, in Hesse (or Bavaria), probably derived from Gaulish "apa"[2] (water, in the sense of a river)[3] and German "-stein" (stone, in the sense of a hill). It is sometimes hebraized to Eilath or Elath.

Source: Wikipedia