| Name | Language | Saint | Meaning | Origin of the name | Celebration |
|---|---|---|---|---|---|
| Ia | Español | Saint Ia | 4 of August | ||
| Ifigenia | Español | Saint Ifigenia vírgen | 21 of September | ||
| Ignacia | Español | Saint Ignatius of Loyola | Fogoso, fervoroso | Latín | 31 of July |
| Ilda | Español | Saint Ilda of Inglaterra | Cantar | Árabe | 17 of November |
| Ilduara | Español | Saint Ilduara | 20 of December | ||
| Iluminada | Español | Saint Iluminada | 29 of November | ||
| Imma | Català | Immaculate Conception of Mary | 8 of December | ||
| Immaculada | Català | Immaculate Conception of Mary | 8 of December | ||
| Ine | Español | Saint Agnes | Cordero (agnus) | Latín | 21 of January |
| Inés | Español | Saint Agnes | Cordero (agnus) | Latín | 21 of January |
| Ingenes | Español | Saint Ingenes | 20 of December | ||
| Ingrid | Español | Blessed Ingrid Elofsdotter | 2 of September | ||
| Inma | Español | Immaculate Conception of Mary | 8 of December | ||
| Inmaculada | Español | Immaculate Conception of Mary | 8 of December | ||
| Iraides | Español | Saint Iraides vírgen y mártir | 22 of September | ||
| Ire | Español | Saint Irene of Tancor | Paz | Griego | 20 of October |
| Irene | Español | Saint Irene of Tancor | Paz | Griego | 20 of October |
| Irina | Español | Saint Irene of Tancor | Paz | Griego | 20 of October |
| Irmina | Español | Saint Irmina of Tréveris | Grande, fuerte | Alemán | 24 of December |
| Isa | Español | Saint Isabel | Consagrada a Dios | Hebreo | 5 of November |
| Isabel | Español | Saint Isabel | Consagrada a Dios | Hebreo | 5 of November |
| Isabela | Español | Saint Isabel | Consagrada a Dios | Hebreo | 5 of November |
| Isabella | English | Saint Isabel | Consagrada a Dios | Hebreo | 5 of November |
| Ita | Español | Saint Ita | 15 of January | ||
| Iutta | Italiano | Saint Judith | Blessed be God | Hebrew | 30 of December |
| Ivanna | Italiano | Saint Joan of Valois | 4 of February | ||
| Iveta | Español | Saint Judith | Blessed be God | Hebrew | 30 of December |
| Ivette | Français | Saint Judith | Blessed be God | Hebrew | 30 of December |
| Izabela | English | Saint Isabel | Consagrada a Dios | Hebreo | 5 of November |