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Cognomen Rusak (Rusak , Русак , Ruhak ) , in the entire world, is a common surname. The cognomen Rusak is habitual in Belarus, where it is quite a common surname, Croatia, where it is quite a rare surname, and Poland. In absolute terms, the name is most common in Eastern Europe, particularly Belarus, Russia, and Poland. Much less frequently, Rusak is the forename as well as the last name.