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Cognomen Tuon (Tuon , Tuhon ) , all over the world, is a rare family name. The family name Tuon is characteristic of Cayman Islands, where it is quite a rare surname, Cambodia, where it is a rare surname, and Switzerland. In absolute terms, it is commonest in Brazil, the United States, and Italy. Much less frequently, Tuon is the forename as well as the last name.