Kahn : 1: North German: occupational name for a boatman from Low German kane ‘small boat barge’.2: North German: from a short form of Kahnert a variant of the personal name Konrad.3: Jewish (Ashkenazic): variant of Cohen.

Source : DAFN2 : Dictionary of American Family Names 2nd edition, ©2022 by Patrick Hanks and Oxford University Press

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