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Surname Kaidan (凯丹 , Kaidan , Кайдан ) , around the world, is quite a rare last name. The last name Kaidan is habitual in Ukraine, where it is quite a rare surname, Japan, where it is a rare surname, and Russia, where it is a very rare surname. Measured by absolute frequency, it is the most numerous in Ukraine, Japan, and China. Also, Kaidan is the forename as well as the last name.