| Name | Meaning | Gender | Origin |
|---|
| Indigo | A dark blue plant dye | Female | Greek |
| Inferno | | Unisex | Hebrew |
| Ink | | Unisex | |
| Inky | | Unisex | Hebrew |
| Iris | rainbow, a play of colours | Female | |
| Isabel | concecrated to God | Female | Spanish |
| Isabella | pledged to God | Female | Spanish |
| Isadora | gift of the moon | Female | Greek |
| Ishta | | Unisex | Hebrew |
| Isis | throne | Female | Egyptian |
| Jackie | supplanter | Female | English |
| Jade | Jewel. Courageous and adoring.
| Female | Spanish |
| Jamaica | Isle with many springs | Female | Place-name |
| Janie | Jehovah Has Been Gracious; Has Shown Favor. Variant Of Joan. | Unisex | English |
| Jasmine | Flower
| Female | Persian |
| Jazzy | Modern variant of Jasmine: combination of Jocelyn and the musical term jazz.
| Female | |
| Jello | | Unisex | Hebrew |
| Jelly-Belly | | Unisex | Hebrew |
| Jenga | | Unisex | Hebrew |
| Jenny | Diminutive of Jane and Jennifer.
| Female | English |
| Jenny | Diminutive of Jane and Jennifer.
| Female | English |
| Jessica | God's grace | Female | Hebrew |
| Jessie | wealthy | Female | Anglicized |
| Jewel | Jewel
| Female | Word |
| Jill | youthful | Female | English |