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Surname Byon (Byon ) , in all the world, is quite a rare last name. The last name Byon is habitual in South Korea, where it is quite a rare surname, the Democratic Republic of the Congo, where it is a rare surname, and Latvia. Measured by absolute frequency, this name is the most popular in South Korea, the Democratic Republic of the Congo, and the United States. Very seldom, Byon is the forename as well as the last name.