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Last name Armas (Arma , Armas , Армас ) , in the world, is a common cognomen. The cognomen Armas is characteristic of Latin America and the Caribbean, particularly Peru, where it is quite a common surname, Guatemala, and Cuba (explore the name in all countries). Not in comparison with a country's population, it is the most numerous in Latin America and the Caribbean, particularly Peru, Mexico, and Venezuela. Very seldom, Armas is the forename as well as the last name.