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Last name Arroyo (Roi , Rojo , Arroyo ) , in all the world, is a widespread family name. The cognomen Arroyo is characteristic of Latin America and the Caribbean, particularly Costa Rica, where it is a common surname, Puerto Rico, and Mexico (explore the name in all countries). In absolute terms, it is commonest in Mexico, Philippines, and Argentina. Much less frequently, Arroyo is the forename as well as the last name.