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Surname Byun (Byun , بيون , 변 ) , across the world, is a common cognomen. The cognomen Byun is characteristic of South Korea, where it is quite a common surname, Malta, where it is quite a rare surname, and Hong Kong. Not in comparison with a country's population, the name is most common in South Korea, the United States, and Indonesia. Much less frequently, Byun is the forename as well as the last name.