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Surname Petrini (Petrini , Петрини ) , throughout the world, is a common cognomen. The surname Petrini is characteristic of Italy, where it is quite a common surname, Sweden, where it is quite a rare surname, and Luxembourg. Not in comparison with a country's population, this name is the most popular in Italy, Argentina, and the United States. Much less frequently, Petrini is the forename as well as the last name.