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Family name Kossak (Kossak
, Косак
, Коссак
) , in the entire world, is quite a rare cognomen. The last name Kossak is characteristic of Eastern Europe, particularly Poland, where it is quite a rare surname, Belarus, where it is a rare surname, and Ukraine. Measured by absolute frequency, it is commonest in Poland, Germany, and Ukraine. Also, Kossak is the forename as well as the last name.