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Surname Guidi (Guidi , جويدي , جويدى ) , across the world, is a common family name. The last name Guidi is characteristic of San Marino, where it is a widespread surname, Italy, where it is quite a common surname, and Argentina, where it is quite a rare surname. Not in comparison with a country's population, the name is most common in Italy, Argentina, and Brazil. Much less frequently, Guidi is the forename as well as the last name.