| Name | Meaning | Gender | Origin |
|---|
| Jay | jaybird | Male | Latin |
| Jeeves | | Male | Hebrew |
| Jen | White, Fair | Unisex | English |
| Jenna | white shadow, white wave | Female | English |
| Jennie | English, God's gracious gift | Female | English |
| Jennifer | white shadow, white wave | Female | Cornish |
| Jenny | Diminutive of Jane and Jennifer.
| Female | English |
| Jenny | Diminutive of Jane and Jennifer.
| Female | English |
| Jenson | son of Jens | Male | Scandinavian |
| Jess | Gift | Male | English |
| Jester | A fool at medieval courts | Unisex | |
| Jezzamyn | | Unisex | Hebrew |
| Jim Crow | | Unisex | Hebrew |
| Johnny Rotten | | Unisex | Hebrew |
| Johnson | Son of John
| Male | English |
| Johnston | From John's farm
| Male | |
| Joker | | Male | Hebrew |
| Jonathan | God gives | Male | Hebrew |
| Jonquil | Reed | Female | English |
| Jordan | The descending river, to flow | Male | Hebrew |
| Junior Mint | | Unisex | Hebrew |
| Juno | queen of the heavens | Female | Latin |
| Kali | after the Indian goddess of death | Female | Sanskrit |
| Kamen | Rock | Unisex | Croatian |
| Kami | Loving | Unisex | Hindu |