Appel

From Low German Appel, Middle Dutch appel, or Yiddish epl "apple", an occupational name for a grower or seller of the fruit. As a Jewish surname, it is generally ornamental rather than occupational.

From the personal name Appel, a pet form of Apprecht (common especially in Thuringia and Franconia), itself a variant of Albrecht. Could also be a short form of Adalbald, or similar names.