| Name | Meaning | Gender | Origin |
|---|
| Iris | rainbow, a play of colours | Female | |
| Isabell | Committed to God.
| Female | |
| Isabella | pledged to God | Female | Spanish |
| Isabelle | pledged to God | Female | |
| Isadora | gift of the moon | Female | Greek |
| Isis | throne | Female | Egyptian |
| Ivory | The hard, smooth, yellowish-white of an elephant's tusk. | Male | Word |
| Ivy | ivy plant, a wine | Female | Plant |
| Jacina | | Unisex | Hebrew |
| Jackie O | | Unisex | Hebrew |
| Jacqueline | Feminine form of Jacques
| Female | |
| Jada | wise | Female | Spanish |
| Jade | Jewel. Courageous and adoring.
| Female | Spanish |
| Jana | Feminine variation of John | Female | Czech |
| Jane | gracious, merciful, God is gracious | Female | English |
| Jasmine | Flower
| Female | Persian |
| Java | Brewed coffee | Female | Anglicization |
| Jazebel | | Unisex | Hebrew |
| Jazzy | Modern variant of Jasmine: combination of Jocelyn and the musical term jazz.
| Female | |
| Jeanette | French variation of Jean, God is gracious | Female | |
| Jeannie | English and Scottish, from French variation of Johanna, God is gracious | Female | English |
| Jelly Baby | | Unisex | Hebrew |
| Jellybean | | Unisex | Hebrew |
| Jemima | dove | Female | Hebrew |
| Jeners | | Unisex | Hebrew |