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Family name Romagnoli (Romagnoli , Романьоли ) , across the world, is a common cognomen. The cognomen Romagnoli is characteristic of Italy, where it is quite a common surname, Argentina, where it is quite a rare surname, and Belgium. Measured by absolute frequency, it is commonest in Italy, Argentina, and Brazil. Very seldom, Romagnoli is the forename as well as the last name.