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Cognomen Sisak (ศรีศักดิ์ , Sisak , Сисак ) , in all the world, is quite a rare family name. The cognomen Sisak is habitual in Armenia, where it is quite a common surname, Slovakia, where it is quite a rare surname, and Hungary. Not in comparison with a country's population, it is the most numerous in Ukraine, Thailand, and Hungary. Likewise, Sisak is the forename as well as the last name.