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Surname Korsak (Korsak , Корсак ) , in the world, is quite a common family name. The cognomen Korsak is characteristic of Eastern Europe, particularly Belarus, where it is quite a common surname, Poland, where it is quite a rare surname, and Ukraine. Not in comparison with a country's population, the name is most common in Eastern Europe, particularly Belarus, Russia, and Ukraine. Much less frequently, Korsak is the forename as well as the last name.