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Surname Antoniuk (Antoniuk , Антонюк ) , worldwide, is a common family name. The cognomen Antoniuk is characteristic of Eastern Europe, particularly Ukraine, where it is quite a common surname, Belarus, and Russia, where it is quite a rare surname. Measured by absolute frequency, it is commonest in Eastern Europe, particularly Ukraine, Russia, and Poland. Much less frequently, Antoniuk is the forename as well as the last name.