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Family name Onisko (Onisko , Онисько , Ониско ) , across the world, is quite a rare last name. The family name Onisko is habitual in Eastern Europe, particularly Ukraine, where it is quite a rare surname, Belarus, and Czechia, where it is a rare surname. Not in comparison with a country's population, it most frequently occurs in Eastern Europe, particularly Ukraine, Russia, and Belarus. Much less frequently, Onisko is the forename as well as the last name.