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Family name Kosciolek (Kosciolek ) , worldwide, is quite a rare last name. The surname Kosciolek is habitual in Poland, where it is quite a rare surname, New Zealand, where it is a rare surname, and the United States, where it is a very rare surname. In absolute terms, it most frequently occurs in Poland, the United States, and Germany. Likewise, Kosciolek is the forename as well as the last name.