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Cognomen Romaniuk (Romaniuk , Романюк ) , throughout the world, is a common surname. The family name Romaniuk is characteristic of Eastern Europe, particularly Ukraine, where it is quite a common surname, Belarus, and Poland, where it is quite a rare surname. Measured by absolute frequency, it is the most numerous in Eastern Europe, particularly Ukraine, Russia, and Belarus. Much less frequently, Romaniuk is the forename as well as the last name.