Complex sentence: Kaplan or Caplan is a family name common among Ashkenazi Jews, usually indicating descent from the priestly lineage (the kohanim), similar to the etymological origin of the common Hebrew surname "Cohen".
Split into simpler sentences: Kaplan or Caplan is a family name common among Ashkenazi Jews, usually indicating descent from the priestly lineage (the kohanim). It should be noted that this is the etymological origin of the Hebrew surname "Cohen".