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Surname Kolchak (Kolchak , Колчак , קולצ'ק ) , across the world, is a rare cognomen. The cognomen Kolchak is habitual in Ukraine, where it is quite a rare surname, Russia, where it is a rare surname, and Kazakhstan, where it is a very rare surname. Not in comparison with a country's population, it most frequently occurs in Ukraine, Russia, and France.