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Last name Boiu (Bun , Bún , Boiu ) , globally, is a common cognomen. The cognomen Boiu is characteristic of Malaysia, where it is quite a common surname, Brunei, and Hong Kong, where it is quite a rare surname. Measured by absolute frequency, this name is the most popular in Malaysia, Indonesia, and the United States. Much less frequently, Boiu is the forename as well as the last name.