Surname Casillo (Casillo 
) , all over the world, is quite a common last name. The family name Casillo is characteristic of Eswatini, where it is quite a common surname, Italy, where it is quite a rare surname, and Bolivia. Not in comparison with a country's population, the name is most common in Italy, the United States, and Philippines. Much less frequently, Casillo is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Casillo | Eswatini, Italy, Philippines, United States, Bolivia |
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giuseppe casillo Italian poet and writer, IT (b. 1916) |
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rick casillo musher, US (b. 1973) |
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luisa casillo Italian volleyball player, IT (b. 1988) |
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| vincenzo casillo Italian criminal, IT (b. 1942) |
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| francesco casillo Italian politician, IT (b. 1948) |
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| pasquale casillo Italian entrepreneur, IT (b. 1948) |
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| benedetto casillo Italian actor, IT (b. 1950) |
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| tommaso casillo Italian politician, IT (b. 1955) |
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| mario casillo Italian digital humanist, IT (b. 1974) |
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| stephanie m casillo researcher |
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| salvatore casillo Italian sociologist, IT |
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| arturo casillo college basketball player (1986–1986) Texas-Rio Grande Valley |
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| flavia casillo |
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| paolo casillo |
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| alessandro casillo Italian singer (1996-), IT (b. 1996) |
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