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Surname Riško (Riško , Ришко ) , all around the world, is a rare family name. The cognomen Riško is habitual in Eastern Europe, particularly Slovakia, where it is a rare surname, Ukraine, and Belarus. Not in comparison with a country's population, it most frequently occurs in Eastern Europe, particularly Ukraine, Russia, and Belarus. Very seldom, Riško is the forename as well as the last name.