Last name Castelletto (Castelletto 
) , worldwide, is a rare family name. The surname Castelletto is habitual in Italy, where it is a rare surname, Austria, and Chile. Not in comparison with a country's population, it most frequently occurs in Italy, France, and Chile. Very seldom, Castelletto is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Castelletto | Austria, France, Argentina, Italy, Chile |
| pietro da castelletto IT (b. 1365) |
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| lorenzo nomis di valfenera e castelletto IT (b. 1590) |
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| francesco nomis di valfenera e castelletto politician, IT (b. 1641) |
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| paolo appiani di castelletto Kingdom of Sardinia politician (1792-1863), IT (b. 1792) |
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jean-charles castelletto Cameroonian footballer, FR (b. 1995) |
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| bernardino del castelletto Italian painter |
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| s. castelletto researcher, ORCID id # 0000-0002-8675-2291, AU |
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| bernardino di giovanni da castelletto Italian painter, died after 1500, IT |
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| valeria castelletto researcher ORCID ID = 0000-0002-3705-0162 |
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| roberto hugo castelletto researcher, AR |
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| giovanni veglio di castelletto academic, member of the Accademia delle Scienze di Torino since 1823 |
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| sergio castelletto |
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Mr, Alida, April, Carlo, Carol, Paulo, Pablo, Paola, Paolo, Davis, Laura, Linda, Luisa, Luigi, José, Josã, Norma, Elisa, Elena, Eddie, Fabio, Iraci, Alice, Mattia, Steve, Marco, Ms, Ana, Ado, Cã, Ron, Marc, Anna, Adam, Koko, Rosa, Dina, Gina, Lisa, Luiz, Luan, Jose, Juan, Enzo, Hugo, Maria, Mario, Mauro, and Sandra