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Cognomen Tuhan (Tohan , Tuhan , Тухан ) , all over the world, is a common family name. The cognomen Tuhan is habitual in Japan, where it is quite a common surname, Turkey, where it is quite a rare surname, and Syria, where it is a rare surname. In absolute terms, it is the most numerous in Japan, Turkey, and Indonesia. Very seldom, Tuhan is the forename as well as the last name.