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Surname Kostik (Костик , Kostik ) , in the world, is quite a common family name. The cognomen Kostik is characteristic of Ukraine, where it is quite a common surname, North Macedonia, where it is quite a rare surname, and Slovakia. Measured by absolute frequency, the name is most common in Eastern Europe, particularly Ukraine, Russia, and Slovakia. Very seldom, Kostik is the forename as well as the last name.