| Name | Meaning | Gender | Origin |
|---|
| Ice | Water frozen solid | Unisex | |
| Iris | rainbow, a play of colours | Female | |
| Ivory | The hard, smooth, yellowish-white of an elephant's tusk. | Male | Word |
| Ivy | ivy plant, a wine | Female | Plant |
| Jade | Jewel. Courageous and adoring.
| Female | Spanish |
| Jasmine | Flower
| Female | Persian |
| Jay | jaybird | Male | Latin |
| Jessamine | Jasmine | Female | French |
| Jet | A deep black colour. Aircraft engine that propels an aircraft forward by expelling exhaust gases toward the rear. | Male | Mineral |
| Jewel | Jewel
| Female | Word |
| Jonquil | Reed | Female | English |
| Juniper | Juniper Tree | Female | English |
| Kamala | lotus | Female | Hindi |
| Katniss | | Female | |
| Katniss | | Female | |
| Kelly | Lively: aggressive.
| Female | Irish |
| Kiri | tree bark | Female | Maori |
| Kodiak | Large Alaskan brown bear. | Female | Russian |
| Laleh | Tulip | Unisex | Persian |
| Lapis | Jewel | Female | Egyptian |
| Laurel | Laurel
| Female | Latin |
| Lavender | Lavender, A Purple Flower | Female | English |
| Leaf | | Male | |
| Leif | heir, descendant | Male | Scandinavian |
| Lemon | | Unisex | Hebrew |