| Name | Language | Saint | Meaning | Origin of the name | Celebration |
|---|---|---|---|---|---|
| Ian | English | Saint John the Baptist, nativity | 24 of June | ||
| Ign | English | Saint Ignatius of Loyola | Fogoso, fervoroso | Latín | 31 of July |
| Ignacio | Español | Saint Ignatius of Loyola | Fogoso, fervoroso | Latín | 31 of July |
| Ignasi | Català | Saint Ignatius of Loyola | Fogoso, fervoroso | Latín | 31 of July |
| Ignatius | English | Saint Ignatius of Loyola | Fogoso, fervoroso | Latín | 31 of July |
| Ilídio | Español | Saint Ilidio of Arvernia | 5 of June | ||
| Iluminado | Español | Saint Iluminado monje | 11 of May | ||
| Iñaki | Euskara | Saint Ignatius of Loyola | Fogoso, fervoroso | Latín | 31 of July |
| Ingenuino | Español | Saint Ingenuino | 5 of February | ||
| Íñigo | Español | Saint Ignatius of Loyola | Fogoso, fervoroso | Latín | 31 of July |
| Inocencio | Español | Saint Innocent I, pope | 12 of March | ||
| Ioseba | Euskara | Saint Joseph | Dios proverá | Hebreo | 19 of March |
| Irenarco | Español | Saint Irenarco | 28 of November | ||
| Isabelino | Español | Blessed Isabelino Carmona Fernández | 6 of November | ||
| Isidro | Español | Saint Isidore the Laborer | 15 of May | ||
| Ismael | Español | Blessed Ismael | 6 of November | ||
| Isquirión | Español | Saint Isquirión | 22 of December | ||
| Israel | Español | Saint Israel | 12 of December | ||
| Iván | Español | Saint John the Baptist, nativity | 24 of June | ||
| Ivón | Español | Saint Ivón | 23 of December |