Cognomen Castelfranco (Castelfranco 
) , around the globe, is a rare family name. The last name Castelfranco is characteristic of Italy, where it is a rare surname, Switzerland, where it is a very rare surname, and Argentina. Not in comparison with a country's population, it is commonest in Italy, Argentina, and the United States. Much less frequently, Castelfranco is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Castelfranco | Switzerland, Italy, France, United States, Argentina |
| pompeo castelfranco Italian prehistoric archaeology, FR (b. 1843) |
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| giorgio castelfranco Italian art historian and critic, IT (b. 1896) |
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| aldo castelfranco Italian engineer, IT (b. 1897) |
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| paul a. castelfranco American plant physiologist, US (b. 1921) |
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Mr, Simone, Simona, Andrea, Stefano, Alessia, Alfredo, Claudio, Giacomo, Eduardo, Eugenio, Mazzocca, Antonino, Fernando, Christian, Gabriella, Alessandro, Antonietta, Sabina, Elisabetta, Elisa, Jason, Ann, Mary, Anna, Kara, Gaia, Lara, John, Irma, Maria, Mario, Marco, Molly, Carlo, Clara, Paula, Diana, Linda, Julie, and Mario Alfredo