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Last name Mancini (Mancini , Манчини , מנסיני ) , throughout the world, is a common surname. The last name Mancini is habitual in San Marino, where it is a common surname, Italy, where it is quite a common surname, and Argentina (explore the name in all countries). Not in comparison with a country's population, it is commonest in Italy, the United States, and Argentina. Very seldom, Mancini is the forename as well as the last name.