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Family name Tarnai (Tarnai
, Тарнай
) , across the world, is quite a rare surname. The last name Tarnai is habitual in Hungary, where it is quite a common surname, Croatia, where it is quite a rare surname, and Slovakia, where it is a rare surname. Measured by absolute frequency, it is commonest in Eastern Europe, particularly Hungary, Ukraine, and Slovakia. Much less frequently, Tarnai is the forename as well as the last name.