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Across the world, Kosak (Kozak , Kosak , Косак ) is a rare gender-neutral forename. The first name Kosak is characteristic of Hungary, where it is a rare epicene name, Poland, where it is a very rare male name, and Turkey, where it is a very rare dominantly female, but uncommonly boy's name. Measured by absolute frequency, it most frequently occurs in Turkey, Indonesia, and India. Likewise, Kosak is the last name as well as the forename.
Kosak is also a name for the fictitious and mythical characters: Kozak , the operatic character in the opera Risurrezione by Franco Alfano.