Cognomen Belcastro (Belcastro 
) , in the entire world, is quite a rare family name. The cognomen Belcastro is habitual in Italy, where it is quite a rare surname, Argentina, and Australia, where it is a rare surname. In absolute terms, the name is most common in Italy, the United States, and Argentina. Very seldom, Belcastro is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Belcastro | Italy, United States, Argentina, Canada, France |
| james belcastro American mobster, US (b. 1895) |
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| alessandro belcastro author (20th century) (b. 1901) |
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| alfredo belcastro (b. 1893) |
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elio vittorio belcastro Italian politician, IT (b. 1954) |
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luca belcastro Italian composer of classical music (born 1964), IT (b. 1964) |
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| oliviero belcastro Italian footballer, IT (b. 1928) |
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lisa belcastro American politician, US (b. 1988) |
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| sarah-marie belcastro American mathematician and book author (b. 1970) |
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| piera belcastro Author of AIDA Informazioni |
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| elena belcastro researcher (ORCID 0000-0003-3876-3591) |
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| philip a belcastro researcher |
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| vincenzo belcastro researcher ORCID ID = 0000-0003-3749-0018 |
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| pete belcastro American broadcaster |
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| justin belcastro college basketball player (2002–2002) West Virginia |
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| claudio belcastro entomologist |
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