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Family name Sydor (Sydor , Сидор , سيدور ) , across the world, is quite a common cognomen. The last name Sydor is characteristic of Eastern Europe, particularly Belarus, where it is quite a rare surname, Ukraine, and Poland. Measured by absolute frequency, it is commonest in Eastern Europe, particularly Ukraine, Belarus, and Russia. Much less frequently, Sydor is the forename as well as the last name.