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Last name Duenas (Dueñas , Duenas ) , around the world, is a common cognomen. The last name Duenas is characteristic of Guam, where it is a widespread surname, El Salvador, where it is quite a common surname, and Peru (explore the name in all countries). In absolute terms, it most frequently occurs in Latin America and the Caribbean, particularly Mexico, Colombia, and Peru. Much less frequently, Duenas is the forename as well as the last name.