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Cognomen Gualtieri (Gualtieri ) , across the world, is a common surname. The family name Gualtieri is habitual in San Marino, where it is a common surname, Italy, where it is quite a common surname, and Argentina, where it is quite a rare surname. Measured by absolute frequency, it is commonest in Italy, Argentina, and the United States. Much less frequently, Gualtieri is the forename as well as the last name.