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Last name Soydan (Soydan , Сойдан ) , all over the world, is a common surname. The cognomen Soydan is habitual in Turkey, where it is quite a common surname, Mauritius, where it is quite a rare surname, and Bulgaria, where it is a rare surname. In absolute terms, it most frequently occurs in Turkey, Germany, and Saudi Arabia. Very seldom, Soydan is the forename as well as the last name.