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Family name Kosek (Kosek , Косэк ) , all over the world, is quite a rare cognomen. The surname Kosek is characteristic of Czechia, where it is quite a common surname, Poland, where it is quite a rare surname, and Croatia. Measured by absolute frequency, this name is the most popular in Poland, Czechia, and the United States. Also, Kosek is the forename as well as the last name.