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Cognomen Kusak (Kusak , Кусак , กู้ศักดิ์) , in all the world, is quite a rare surname. The surname Kusak is characteristic of Czechia, where it is quite a rare surname, Poland, and Lithuania, where it is a rare surname. Measured by absolute frequency, the name is most common in Poland, Czechia, and the United States. Also, Kusak is the forename as well as the last name.