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Surname Buan (Buan , บัน , บวน ) , throughout the world, is a common cognomen. The cognomen Buan is characteristic of Philippines, where it is quite a common surname, Norway, where it is quite a rare surname, and Malaysia. In absolute terms, it is the most numerous in South-eastern Asia, particularly Philippines, Malaysia, and Indonesia. Much less frequently, Buan is the forename as well as the last name.