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Last name Каяхан (Kayahan , Каяхан , Kaiakhan ) , in all the world, is quite a common cognomen. The surname Каяхан is habitual in Turkey, where it is quite a rare surname, Austria, where it is a rare surname, and Netherlands. In absolute terms, it is the most numerous in Turkey, France, and Germany. Very seldom, Каяхан is the forename as well as the last name.