| Name | Meaning | Gender | Origin |
|---|
| Irving | handsome, fair | Male | Scottish |
| Isadora | gift of the moon | Female | Greek |
| Isolde | beautiful | Female | Welsh |
| 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 |
| Jasmine | Flower
| Female | Persian |
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |
| Jay | jaybird | Male | Latin |
| Jen | White, Fair | Unisex | English |
| Jennie | English, God's gracious gift | Female | English |
| Jennifer | white shadow, white wave | Female | Cornish |
| Jenny | Diminutive of Jane and Jennifer.
| Female | English |
| Jenny | Diminutive of Jane and Jennifer.
| Female | English |
| Joseph | God will increase | Male | Hebrew |
| Josephine | God will increase | Female | |
| Joy | From Joyce - Gay and joyful | Female | Word |
| Juliet | youthful | Female | English |
| June | 6Th Month | Female | English |
| Juniper | Juniper Tree | Female | English |
| Kami-kaze | | Unisex | Hebrew |
| Keanu | cool breeze over the mountains | Male | Hawaiian |