Cognomen Caillou (Caillou 
, كايلو) , in the entire world, is a rare family name. The surname Caillou is characteristic of Mauritius, where it is quite a rare surname, France, and Belgium, where it is a rare surname. In absolute terms, it is the most numerous in France, Argentina, and Belgium. Much less frequently, Caillou is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Caillou | Belgium, France, Mauritius, Brazil, Argentina |
| edmond de caillou Gascon soldier (b. 1201) |
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robert caillou French rugby union player, FR (b. 1918) |
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| alan caillou British actor and writer (1914-2006), GB (b. 1914) |
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| andré caillou FR (b. 1920) |
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| marie caillou comic book artist, FR (b. 1971) |
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| jean-sylvain caillou FR (b. 1974) |
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| caillou pettis Canadian actor, director, film critic, CA |
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Mr, Luan, John, Jean, Juan, Juju, Tony, Eric, Ermy, Emma, Hugo, Fred, Ines, Maria, Marie, Marta, Manon, Mamie, Sandy, Shawn, Simon, Serge, Luis, Loic, Lisa, Lili, Le, Ju, Max, Mon, Gã, Lea, Lou, Elo, Marc, Maud, Sonia, Mena, Alex, Anne, Aida, Camy, Coco, Kaya, Rene, Regi, Remy, Rima, Swag, and Steph