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Last name Csak (Csak , Csák ) , all over the world, is quite a rare surname. The family name Csak is habitual in Hungary, where it is quite a common surname, Romania, where it is a rare surname, and Canada, where it is a very rare surname. Measured by absolute frequency, it most frequently occurs in Hungary, Romania, and the United States. Much less frequently, Csak is the forename as well as the last name.