| Name | Meaning | Gender | Origin |
|---|
| Icicle | | Unisex | Hebrew |
| Igloo | Dome shaped Eskimo house made of blocks of snow. | Unisex | |
| Indie | | Unisex | Hebrew |
| Indigo | A dark blue plant dye | Female | Greek |
| Inky | | Unisex | Hebrew |
| Iona | flower name, purple jewel | Female | Scottish |
| Iris | rainbow, a play of colours | Female | |
| Isis | throne | Female | Egyptian |
| Ivy | ivy plant, a wine | Female | Plant |
| Jacinthe | Hyacinth.
| Female | |
| Jade | Jewel. Courageous and adoring.
| Female | Spanish |
| Jady | The Gemstone Jade; The Color Green. | Unisex | English |
| Jadzia | Princess | Unisex | Polish |
| Jaffa | beautiful | Female | Hebrew |
| Jasmine | Flower
| Female | Persian |
| Java | Brewed coffee | Female | Anglicization |
| 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 |
| Jester | A fool at medieval courts | Unisex | |
| Jetta | jet | Female | English |
| Jonquil | Reed | Female | English |
| Juniper | Juniper Tree | Female | English |