| Name | Meaning | Gender | Origin |
|---|
| Indigo | A dark blue plant dye | Female | Greek |
| Iron | | Unisex | Hebrew |
| Irving | handsome, fair | Male | Scottish |
| Ivory | The hard, smooth, yellowish-white of an elephant's tusk. | Male | Word |
| Jacinda | Beautiful
| Female | English |
| Jada | wise | Female | Spanish |
| Jade | Jewel. Courageous and adoring.
| Female | Spanish |
| Jady | The Gemstone Jade; The Color Green. | Unisex | English |
| Jaeger | Hunter | Unisex | German |
| Jameson | son of James | Male | English |
| Jasmine | Flower
| Female | Persian |
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |
| Jayda | Green Gemstone | Unisex | English |
| Jelly | | Unisex | Hebrew |
| Jemma | Italian, precious stone | Female | Spelling |
| Jesper | Treasure | Unisex | Danish |
| Jet | A deep black colour. Aircraft engine that propels an aircraft forward by expelling exhaust gases toward the rear. | Male | Mineral |
| Jethro | excellence | Male | Hebrew |
| Jett | Jet Black Gem | Male | English |
| Jetta | jet | Female | English |
| Jewel | Jewel
| Female | Word |
| Jing | Pure Epitomy | Unisex | Chinese |
| Joaquin | Abbreviation of the Hebrew name Jehoichin meaning Jehovah has established. Joaquin Miller the colorful 19th century poet-adventurer of the American west.
| Male | Spanish |