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Cognomen Çetin (Çetin , Четин , شتين ) , all around the world, is a common surname. The family name Çetin is characteristic of Turkey, where it is quite a common surname, Cyprus, where it is quite a rare surname, and Turkmenistan. Measured by absolute frequency, the name is most common in Turkey, Russia, and Iraq. Much less frequently, Çetin is the forename as well as the last name.