Cognomen Illescas (Illescas 
) , around the world, is a common family name. The cognomen Illescas is characteristic of Latin America and the Caribbean, particularly Guatemala, where it is quite a common surname, Mexico, where it is quite a rare surname, and Bolivia. In absolute terms, it most frequently occurs in Latin America and the Caribbean, particularly Guatemala, Mexico, and Argentina. Much less frequently, Illescas is the forename as well as the last name.
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| Illescas | Mexico, Spain, Argentina, Peru, Guatemala |
| gonzalo de illescas Spanish historian and abbot, ES (b. 1521) |
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| josé gabriel zapata illescas Roman Catholic bishop (b. 1678) |
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| carlos gonzález illescas CL (b. 1880) |
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miguel illescas Spanish chess grandmaster, ES (b. 1965) |
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| carlos illescas Guatemalan poet, GT (b. 1918) |
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gonzalo de illescas Spanish Roman Catholic bishop, ES |
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| albert illescas de la morena ES (b. 1940) |
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| alejandro illescas Mexican voice actor (b. 1960) |
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| julio illescas Guatemalan cyclist, GT (b. 1962) |
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| carmen orellana illescas ES (b. 1957) |
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| juan illescas PE (b. 1959) |
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| maría illescas researcher |
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| marina lozano illescas Spanish politician, ES |
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| maría j illescas researcher |
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| sergio bueno illescas Spanish politician, ES |
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