Family name Calzo (Calzo 
) , all over the world, is a rare last name. The cognomen Calzo is habitual in Philippines, where it is a rare surname, Belgium, and Italy, where it is a very rare surname. Measured by absolute frequency, this name is the most popular in Philippines, Mexico, and the United States. Much less frequently, Calzo is the forename as well as the last name.
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| Calzo | China, Italy, Philippines, Mexico, United States |
| nick del calzo American photographer and journalist |
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| jerel p calzo researcher (ORCID 0000-0002-4656-1052) |
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| nicola lo calzo (b. 1979) |
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| antonello lo calzo |
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Jd, Loyd, Luis, Jose, Juan, Nick, Nilo, Nely, Edna, Emma, Liza, Vito, Mario, Sasha, Shirl, Anita, Chris, Carlo, Betty, Paolo, Pedro, Maria, Lisa, Lily, Leny, Sam, Gio, Leo, Joy, Jil, Mark, Alex, Anna, Pino, Phil, Raul, Rona, Roel, Ruby, Rudy, Ruel, Rhea, Dick, Gina, Glem, Lara, Piere, and Randy