| Name | Meaning | Gender | Origin |
|---|
| Isa | strong-willed | Female | |
| Isabella | pledged to God | Female | Spanish |
| Isabelle | pledged to God | Female | |
| Ivory | The hard, smooth, yellowish-white of an elephant's tusk. | Male | Word |
| Izzy | Salvation By God | Male | English |
| Jack Daniels | | Unisex | Hebrew |
| Jacob | The supplanter, held by the heel | Male | Hebrew |
| Jada | wise | Female | Spanish |
| Jade | Jewel. Courageous and adoring.
| Female | Spanish |
| Jamaica | Isle with many springs | Female | Place-name |
| Jasmine | Flower
| Female | Persian |
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |
| Jeep | | Unisex | Hebrew |
| Jello | | Unisex | Hebrew |
| Jennie | English, God's gracious gift | Female | English |
| Jeremy | God will uplift, appointed by God | Male | English |
| Jesse | wealthy | Male | Hebrew |
| Jonquil | Reed | Female | English |
| Joy | From Joyce - Gay and joyful | Female | Word |
| Julius | after Julius Caesar | Male | Latin |
| Kali | after the Indian goddess of death | Female | Sanskrit |
| Keegan | A thinker: fiery. Form of Hugh.
| Male | Irish |
| Kelly | Lively: aggressive.
| Female | Irish |