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Surname Petroni (Petroni , פרטוני , Петрони) , around the world, is quite a common cognomen. The surname Petroni is characteristic of Malta, where it is quite a common surname, Italy, where it is quite a rare surname, and Argentina. Measured by absolute frequency, the name is most common in Italy, Brazil, and Argentina. Much less frequently, Petroni is the forename as well as the last name.