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.
| adelfio elio cardinale Italian physician and teacher, IT (b. 1940) |
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| salvatore adelfio IT (b. 1966) |
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| giada adelfio researcher ORCID ID = 0000-0002-3194-4296 |
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| marco adelfio Ph.D. University of Maryland College Park 2014 |
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