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Surname Kotan (Kotan , Котан , โกตัน ) , around the world, is a common cognomen. The cognomen Kotan is characteristic of Turkey, where it is quite a common surname, Hungary, where it is quite a rare surname, and Czechia, where it is a rare surname. In absolute terms, it most frequently occurs in Turkey, Japan, and Indonesia. Very seldom, Kotan is the forename as well as the last name.