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Family name Karahan (Karahan , Карахан ) , in all the world, is a common surname. The cognomen Karahan is characteristic of Turkey, where it is quite a common surname, Cyprus, where it is quite a rare surname, and Malta. Not in comparison with a country's population, the name is most common in Turkey, Germany, and France. Much less frequently, Karahan is the forename as well as the last name.