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Surname Affonso (Affonso , אפונסו ) , around the globe, is a common family name. The last name Affonso is characteristic of Latin America and the Caribbean, particularly Trinidad and Tobago, where it is quite a rare surname, Brazil, and Uruguay. In absolute terms, the name is most common in Brazil, Argentina, and the United States. Likewise, Affonso is the forename as well as the last name.