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Last name Буи (Bui , Boui , 武井 ) , globally, is a widespread cognomen. The surname Буи 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). In absolute terms, it is commonest in Vietnam, the United States, and Australia. Much less frequently, Буи is the forename as well as the last name.