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Family name Iwana (Ивана , Iwana , イワナ ) , all around the world, is a common cognomen. The cognomen Iwana is characteristic of Bulgaria, where it is a common surname, Serbia, where it is quite a rare surname, and Malaysia, where it is a rare surname. Measured by absolute frequency, it is commonest in Bulgaria, Serbia, and Indonesia. Likewise, Iwana is the forename as well as the last name.