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Last name Буй (Bui , Boey , Buj ) , all around the world, is a widespread surname. The family name Буй is characteristic of Macao, where it is a common surname, Vietnam, where it is quite a common surname, and British Virgin Islands (explore the name in all countries). Measured by absolute frequency, it is commonest in Vietnam, the United States, and Malaysia. Much less frequently, Буй is the forename as well as the last name.