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Surname Moroni (Moroni , Mroni , Морони ) , around the globe, is a common last name. The family name Moroni is characteristic of 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 the most numerous in Italy, Argentina, and Brazil. Much less frequently, Moroni is the forename as well as the last name.