Cognomen Castelnuovo (Castelnuovo 
, קסטלנואובו 
) , all around the world, is quite a rare family name. The surname Castelnuovo is characteristic of Italy, where it is quite a rare surname, Argentina, and Switzerland, where it is a rare surname. Much less frequently, Castelnuovo is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Castelnuovo | Argentina, Japan, United States, Switzerland, Italy |
| קסטלנואובו | Israel |
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giambattista castelnuovo IT (b. 1757) |
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enrico castelnuovo Italian writer (1839-1915), FR (b. 1839) |
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guido castelnuovo Italian mathematician (1865–1952), IT (b. 1865) |
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| giacomo castelnuovo IT (b. 1819) |
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elías castelnuovo Argentinian writer and journalist, UY (b. 1893) |
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mario castelnuovo-tedesco Italian composer, US (b. 1895) |
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| paolo castelnuovo Italian entrepreneur, IT (b. 1861) |
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nino castelnuovo Italian actor (1936-2021), IT (b. 1936) |
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| emma castelnuovo Italian teacher (1913-2014), IT (b. 1913) |
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| vittorio castelnuovo Swiss singer-songwriter (1915-2005), CH (b. 1915) |
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| enrico castelnuovo Italian art historian (1929-2014), IT (b. 1929) |
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| shirley castelnuovo (b. 1930) |
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| mario castelnuovo Italian singer-songwriter, IT (b. 1955) |
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| guido castelnuovo Italian historian, IT (b. 1963) |
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| gianluca castelnuovo researcher (b. 1975) |
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Mr, Rosa, Rita, Dave, Gian, Lara, Luca, Luis, Jose, Juan, Nina, Nora, Emma, Ivan, Iuri, Omar, Yoel, Ynes, Maria, Marie, Mario, Marta, Raul, Martu, Pier, Adad, Ms, May, Ana, Roy, Gea, Gil, Lea, Joe, Tom, Teo, Ema, Isa, Ida, Mary, Mara, Maru, Mica, Sara, Alex, Aldo, Anna, Ciro, and Marco