| Name | Meaning | Gender | Origin |
|---|
| Idurre | Reference to the Virgin Mary
| Female | |
| Ignacia | Fire
| Female | Latin |
| Ignacio | fiery | Male | Spanish |
| Ignado | Fire
| Male | |
| Ignazio | Fire
| Male | |
| Igone | Ascension
| Female | |
| Ikerne | Visitation
| Female | |
| Ileanna | Variant of Elena.
| Female | |
| Iliana | from Ilium or Troy | Female | Greek |
| Inca | | Unisex | Hebrew |
| Inez | pure, virginal | Female | Portuguese |
| Irene | Peace
| Female | Greek |
| Isa | strong-willed | Female | |
| Isabel | concecrated to God | Female | Spanish |
| Isabell | Committed to God.
| Female | |
| Isabella | pledged to God | Female | Spanish |
| Ishmael | outcast | Male | Hebrew |
| Isidoro | Gift Of Isis, Mythical Goddess Of Sky And Nature | Unisex | Italian |
| Ismael | Hebrew, God will hearken; Arabic, outcast | Male | Spanish |
| Ivan | Form of John | Male | Russian |
| Izabelle | Beautiful
| Female | |
| Jacinto | hyacinth | Male | Spanish |
| Jade | Jewel. Courageous and adoring.
| Female | Spanish |
| Jago | A character in a Victorian book who battled against the odds | Male | Spanish |
| Jaione | Reference to the Nativity
| Female | |