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Surname Sidun (斯顿 , Sidun , Сидун ) , all over the world, is quite a rare family name. The cognomen Sidun is characteristic of Eastern Europe, particularly Ukraine, where it is quite a rare surname, Belarus, where it is a rare surname, and Slovakia. In absolute terms, it is the most numerous in Ukraine, Russia, and China. More prevalently, Sidun is the forename as well as the last name.