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Family name Prieto (Prieto , Приэто , プリエト ) , worldwide, is a widespread surname. The cognomen Prieto is habitual in Paraguay, where it is a common surname, Colombia, and Spain, where it is quite a common surname (explore the name in all countries). Measured by absolute frequency, it is the most numerous in Colombia, Mexico, and Spain. Very seldom, Prieto is the forename as well as the last name.