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Family name Magni (Magni , マーニ ) , in the entire world, is a common cognomen. The surname Magni is habitual in Italy, where it is quite a common surname, Cameroon, and Argentina, where it is quite a rare surname. In absolute terms, it is the most numerous in Italy, Cameroon, and Brazil. Much less frequently, Magni is the forename as well as the last name.