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Cognomen Klaczko (Klaczko , Клачко , קלאצקא ) , throughout the world, is a rare family name. The surname Klaczko is habitual in Belarus, where it is a rare surname, Ukraine, and Uruguay. In absolute terms, the name is most common in Eastern Europe, particularly Ukraine, Belarus, and Poland. Much less frequently, Klaczko is the forename as well as the last name.