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Family name Ergün (Ergün , Эргюн ) , all over the world, is a common last name. The last name Ergün is characteristic of Turkey, where it is quite a common surname, Cyprus, where it is quite a rare surname, and Germany, where it is a rare surname. Measured by absolute frequency, it is commonest in Turkey, Germany, and Austria. Likewise, Ergün is the forename as well as the last name.