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Last name Carballo (Carballo , Carvallo ) , around the world, is a widespread surname. The cognomen Carballo is characteristic of Latin America and the Caribbean, particularly Costa Rica, where it is a common surname, Paraguay, where it is quite a common surname, and Uruguay (explore the name in all countries). In absolute terms, it most frequently occurs in Argentina, Mexico, and Spain. Much less frequently, Carballo is the forename as well as the last name.