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Cognomen Grytsyuk (Грицюк , Grytsyuk , Грыцюк ) , throughout the world, is a common last name. The surname Grytsyuk is habitual in Eastern Europe, particularly Ukraine, where it is quite a common surname, Belarus, where it is quite a rare surname, and Russia. Measured by absolute frequency, it is the most numerous in Ukraine, Russia, and Kazakhstan.