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Worldwide, Ildefonso (Ildefonso
) is a common male first name. The first name Ildefonso is characteristic of Equatorial Guinea, where it is quite a common masculine name, Spain, where it is quite a rare boy's name, and Mexico. Not in comparison with a country's population, this name is the most popular in Mexico, Philippines, and Brazil. Also, Ildefonso is the last name as well as the forename.