| Name | Meaning | Gender | Origin |
|---|
| Idoia | Reference to the Virgin Mary
| Female | |
| Idurre | Reference to the Virgin Mary
| Female | |
| Ignacia | Fire
| Female | Latin |
| Ignado | Fire
| Male | |
| Ignazio | Fire
| Male | |
| Igone | Ascension
| Female | |
| Ikerne | Visitation
| Female | |
| Ileanna | Variant of Elena.
| Female | |
| Iliana | from Ilium or Troy | Female | Greek |
| Inez | pure, virginal | Female | Portuguese |
| Inga | guarded by Ing | Female | Norse |
| Irene | Peace
| Female | Greek |
| Isabel | concecrated to God | Female | Spanish |
| Isabella | pledged to God | Female | Spanish |
| Isabelle | pledged to God | Female | |
| 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 |
| Izzy | Salvation By God | Male | English |
| 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 | |
| Jairo | Variant of the Hebrew Jairus Jehovah enlightens.
| Male | |