Cognomen Castoldi (Castoldi 
) , across the world, is quite a common last name. The surname Castoldi is characteristic of Italy, where it is quite a rare surname, Argentina, and Brazil, where it is a rare surname. Much less frequently, Castoldi is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Castoldi | Brazil, Italy, Argentina, United States, France |
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jean-jacques castoldi Swiss politician, lawyer and judge (1804-1871), CH (b. 1804) |
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alberto castoldi Italian engineer and politician (1848-1922), IT (b. 1848) |
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| francesco castoldi author (19th century) (b. 1801) |
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| guglielmo castoldi Italian painter (1823-1882), IT (b. 1823) |
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mario castoldi Italian engineer, IT (b. 1888) |
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| filippo castoldi Italian footballer, IT (b. 1850) |
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luigi castoldi Italian engineer and entrepreneur, IT (b. 1906) |
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| antenore castoldi IT (b. 1872) |
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| pedro castoldi Argentinian association football player, AR (b. 1900) |
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| achille castoldi Italian engineer, IT (b. 1904) |
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| luigi castoldi Italian physicist and mathematician (1911-1991), IT (b. 1911) |
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| maggiorina castoldi Italian school teacher and children's writer (1921-1999), IT (b. 1921) |
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| marcello castoldi Italian footballer, IT (b. 1925) |
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| giuseppe castoldi IT (b. 1922) |
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michela castoldi Italian gymnast (1995-), IT (b. 1995) |
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Mr, Sara, Alex, Alan, Aldo, Andy, Anna, Anor, Adam, Adao, Agus, Aida, Carl, Ciro, Kate, Kaua, Keli, Paul, Pete, Pier, Raul, Rosa, Mike, Mega, Mara, Mary, Ms, Lu, Fe, Max, Ale, Ana, Ari, Ary, Ada, Ken, Rose, Ray, Guy, Leo, Jim, Edi, Emi, Eva, Val, Ivo, Ida, Ian, Rui, and Roni