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Last name Mancilla (Mancilla ) , across the world, is a widespread surname. The last name Mancilla is habitual in Latin America and the Caribbean, particularly Chile, where it is quite a common surname, Guatemala, and Bolivia (explore the name in all countries). Measured by absolute frequency, it is the most numerous in Latin America and the Caribbean, particularly Mexico, Chile, and Colombia. Very seldom, Mancilla is the forename as well as the last name.