Last name Ildefonso (Ildefonso 
) , worldwide, is a common surname. The surname Ildefonso is habitual in Spain, where it is quite a common surname, Mexico, and Puerto Rico, where it is quite a rare surname. Not in comparison with a country's population, it is the most numerous in Spain, Mexico, and Philippines. Likewise, Ildefonso is the forename as well as the last name.
| mariano san ildefonso (b. 1904) |
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| danny ildefonso Filipino basketball player, PH (b. 1976) |
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| adrian ildefonso researcher |
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| cristhian j ildefonso researcher |
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| gertrudis de san ildefonso |
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| sean dave ildefonso basketball player, PH |
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