Cognomen Casillas (Casillas 
, كاسياس 
) , across the world, is a common family name. The cognomen Casillas is habitual in Latin America and the Caribbean, particularly Mexico, where it is quite a common surname, Puerto Rico, and Bolivia. Not in comparison with a country's population, it is commonest in Mexico, the United States, and Spain. Much less frequently, Casillas is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Casillas | Bolivia, Spain, Guatemala, Mexico, United States |
| كاسياس | Iraq, Egypt, Sudan |
| francisco casillas association football player, MX (b. 1901) |
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graciela casillas American kickboxer, US (b. 1957) |
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| joaquín casillas Cuban military personnel, CU (b. 1907) |
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tony casillas American football player (born 1963), US (b. 1963) |
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| agustín casillas Spanish sculptor, ES (b. 1921) |
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iker casillas fernández Spanish association football player, ES (b. 1981) |
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hugo casillas Mexican footballer, MX (b. 1981) |
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| andrés casillas de alba Mexican architect, MX (b. 1934) |
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| jaime enríquez casillas Mexican politician, MX (b. 1935) |
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| toñín casillas Puerto Rican Olympic basketball player, US (b. 1935) |
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jonathan casillas American football player, US (b. 1987) |
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míriam casillas Spanish triathlete, ES (b. 1992) |
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| mario casillas MX (b. 1938) |
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| fidencio casillas Mexican association football player, MX (b. 1950) |
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| hector casillas badminton player, MX (b. 1953) |
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