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Cognomen Olejnik (Olejnik , Олейник , Олійник ) , in the entire world, is a widespread surname. The cognomen Olejnik is habitual in Eastern Europe, particularly Ukraine, where it is a common surname, Poland, where it is quite a common surname, and Belarus (explore the name in all countries). Measured by absolute frequency, it is the most numerous in Eastern Europe, particularly Ukraine, Russia, and Poland. Very seldom, Olejnik is the forename as well as the last name.