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Surname Sivak (Sivak , Сивак , Сівак ) , in the entire world, is a common cognomen. The cognomen Sivak is habitual in Eastern Europe, particularly Slovakia, where it is quite a common surname, Ukraine, and Belarus. Measured by absolute frequency, it is commonest in Eastern Europe, particularly Ukraine, Russia, and Slovakia. Much less frequently, Sivak is the forename as well as the last name.