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Family name Klek (Klek , Клек ) , around the world, is a rare surname. The surname Klek is habitual in Poland, where it is quite a rare surname, Ukraine, where it is a rare surname, and Belgium, where it is a very rare surname. Measured by absolute frequency, it is commonest in Poland, Ukraine, and the United States. More prevalently, Klek is the forename as well as the last name.