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Cognomen Guidan (桂丹 , 贵丹 , Guidan ) , in the world, is a rare last name. The cognomen Guidan is characteristic of China, where it is a very rare surname, Philippines, and Mexico, where it is an extremely rare surname. In absolute terms, it is the most numerous in China, Philippines, and the United States. More prevalently, Guidan is the forename as well as the last name.