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Last name Byung (Byung , Бюнг , بيونغ) , globally, is a rare surname. The surname Byung is habitual in Hungary, where it is a rare surname, Indonesia, where it is a very rare surname, and Colombia. Measured by absolute frequency, it most frequently occurs in Indonesia, China, and the United States. Much more prevalently, Byung is the forename as well as the last name.