Surname Callero (Callero 
) , across the world, is quite a rare family name. The cognomen Callero is habitual in Uruguay, where it is quite a common surname, Argentina, where it is quite a rare surname, and Spain, where it is a rare surname. Very seldom, Callero is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Callero | Uruguay, Spain, Argentina, Italy, United States |
| jacinto callero Uruguayan association football player, UY (b. 1945) |
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| bob callero Italian musician and composer, IT (b. 1950) |
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| carlos callero Uruguayan drawer, UY (b. 1956) |
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| joe callero American basketball player-coach, US (b. 1962) |
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| mariana a callero researcher |
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| mathias callero association football player, UY (b. 1992) |
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| mathías callero association football player, UY (b. 1992) |
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Mr, Rafa, Raul, Rosa, Rosi, Rita, Davi, Gary, Lina, Lisa, Luca, Lucy, Luis, Lupe, Lula, Jose, John, Joao, Jere, Jean, Jeff, Juan, Paul, Tony, Kara, Agus, Ms, Mª, Ana, Bel, Bob, Roy, Dan, Leo, Lee, Joe, Tom, Nic, Ema, Marc, Mary, Mati, Mike, Mika, Sara, Sean, Sofi, Ceci, and Tess