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Last name Lahun (Lahun , Лагун , Лахун ) , globally, is quite a rare cognomen. The cognomen Lahun is habitual in Belarus, where it is quite a common surname, Latvia, where it is quite a rare surname, and Ukraine. Measured by absolute frequency, it most frequently occurs in Eastern Europe, particularly Belarus, Russia, and Ukraine. Much less frequently, Lahun is the forename as well as the last name.