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Surname Rotar (Rotar , Ротарь , Ротар ) , around the world, is a common cognomen. The family name Rotar is habitual in Slovenia, where it is quite a common surname, Romania, and Moldova (explore the name in all countries). Measured by absolute frequency, it is commonest in Eastern Europe, particularly Ukraine, Romania, and Russia. Very seldom, Rotar is the forename as well as the last name.