Around the world, Idelfonso (Idelfonso 
) is a common masculine given name. The given name Idelfonso is habitual in Equatorial Guinea, where it is quite a rare male name, Mexico, and Spain. Not in comparison with a country's population, it is commonest in Brazil, Mexico, and Spain. Also, Idelfonso is the last name as well as the forename.
| idelfonso valdastri (b. 1762) |
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| idelfonso nieri Italian philologist, IT (b. 1853) |
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| idelfonso rivera alcayaga Chilean physician and politician, CL (b. 1871) |
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| idelfonso pereira araujo Brazilian politician, BR (b. 1962) |
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| idelfonso de jesus lopes politician from Brazil, BR (b. 1966) |
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| idelfonso datu chess player (b. 1972) |
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| idelfonso izquierdo-marquez researcher |
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| idelfonso tafur monroy researcher ORCID 0000-0003-1747-3405 |
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| idelfonso castañeda noa botanist |
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| idelfonso b r nogueira researcher |
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| idelfonso muanantapha Mozambican politician, MZ |
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| idelfonso da silva East Timorese footballer, TL |
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| idelfonso tafur monroy researcher (ORCID 0000-0002-2935-7682) |
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| idelfonso dos santos (b. 1986) |
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| idelfonso micheli IT |
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