| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 621 | Ignacia | Spanish | Fire. | F | |
| 622 | Ignado | Spanish | Fire. | M | |
| 623 | Ignazio | Spanish | Fire. | M | |
| 624 | Igone | Spanish | Ascension. | F | |
| 625 | Ikerne | Spanish | Visitation. | F | |
| 626 | Ileanna | Spanish | Variant of Elena. | F | |
| 627 | Iliana | Spanish | Variant of Elena. | F | |
| 628 | Iliana | Spanish | Variant of Elena. | M | |
| 629 | Iluminada | Spanish | Illuminated. | F | |
| 630 | Imelda | Spanish | Powerful fighter. The name of a fourteenth-century Spanish saint. | F | |
| 631 | Immaculada | Spanish | The Immaculate Conception. | F | |
| 632 | Incendio | Spanish | Fire. | M | |
| 633 | Ines | Spanish | Meek. Chaste. Variant of Agnes. | F | |
| 634 | Inez | Spanish | Pure. Chaste. The Spanish version of Agnes. | F | |
| 635 | Inigo | Spanish | Fiery. Spanish variant of the Latin name, Ignatius. | M | |
| 636 | Inocencio | Spanish | Innocent. | M | |
| 637 | Inoceneia | Spanish | Innocent. | F | |
| 638 | Inocenta | Spanish | Innocent. | F | |
| 639 | Inocente | Spanish | Innocent. | M | |
| 640 | Iratze | Spanish | Reference to the Virgin Mary. | F | |