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Cognomen Stadnik (Stadnik , Стадник ) , in the world, is a common surname. The surname Stadnik is characteristic of Eastern Europe, particularly Ukraine, where it is quite a common surname, Belarus, where it is quite a rare surname, and Poland. Measured by absolute frequency, it is commonest in Eastern Europe, particularly Ukraine, Russia, and Poland. Very seldom, Stadnik is the forename as well as the last name.