The surname Cohen comes from the hebrew word for priest and are said to be descended from the priesthood of the kingdom of Judah, the Cohanim. (Kohen, Hebrew כֹּהֵן, 'priest', pl. כוהנים, Kohanim) common to Ashkenazi and Sepherdics who trace their patrilineal descent from the Biblical Aaron.
Additional forms are: Kahn, Kohen, Coen, Cohn