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Surname Tres (Tri , Tres , تريس ) , all over the world, is a common family name. The family name Tres is habitual in South-eastern Asia, particularly Indonesia, where it is quite a common surname, Vietnam, where it is quite a rare surname, and Brunei. Measured by absolute frequency, the name is most common in Indonesia, Vietnam, and Brazil. More prevalently, Tres is the forename as well as the last name.