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Surname Adelfio (Adelfio
) , across the world, is a rare cognomen. The cognomen Adelfio is habitual in Italy, where it is quite a rare surname, Singapore, where it is a very rare surname, and Switzerland. Not in comparison with a country's population, this name is the most popular in Italy, the United States, and Peru. Also, Adelfio is the forename as well as the last name.