| Name | Meaning | Gender | Origin |
|---|
| Ira | watchful, descendant | Male | Hebrew |
| Iris | rainbow, a play of colours | Female | |
| Isadora | gift of the moon | Female | Greek |
| Ivory | The hard, smooth, yellowish-white of an elephant's tusk. | Male | Word |
| Ivy | ivy plant, a wine | Female | Plant |
| Jack | after the Georgetown University mascot, Jack the Bulldog | Male | English |
| Jack | From John - God's gracious gift | Male | English |
| Jamie | Feminine of James | Female | Scottish |
| Jane | gracious, merciful, God is gracious | Female | English |
| Jean | God is gracious | Male | |
| Jetta | jet | Female | English |
| Jezebel | follower of idols | Female | Hebrew |
| Jinx | Charm, Spell | Female | Latin |
| Juno | queen of the heavens | Female | Latin |
| Kali | after the Indian goddess of death | Female | Sanskrit |
| Kara | pure | Female | English |
| Keegan | A thinker: fiery. Form of Hugh.
| Male | Irish |
| Keira | after the actress Keira Knightley | Female | Irish |
| Keiran | Little, Dark | Unisex | Celtic |
| Kelby | Dark: dark-haired.
| Male | English |
| Keri | Black, Dark | Unisex | English |
| Kerry | dark, dark-haired | Male | Irish |
| Kiara | Italian, light, clear | Female | Spelling |
| Kiora | Little, Dark | Unisex | Celtic |
| Kira | Dark Lady.
| Female | Russian |