| Name | Meaning | Gender | Origin |
|---|
| Jake | From Jacob - To fill the place of another | Male | Hebrew |
| James | From Jacob - To fill the place of another, supplanter. | Male | English |
| Jasmine | Flower
| Female | Persian |
| Jellylorum | | Unisex | Hebrew |
| Jennie | English, God's gracious gift | Female | English |
| Jenny | Diminutive of Jane and Jennifer.
| Female | English |
| Jenny | Diminutive of Jane and Jennifer.
| Female | English |
| Jerry | after Jerry Garcia, The Grateful Dead | Male | English |
| Jess | Gift | Male | English |
| Joe | Abbreviation of Joseph.
| Male | English |
| Joe | Abbreviation of Joseph.
| Male | English |
| Jones | God Will Bring | Male | Welsh |
| Julius | after Julius Caesar | Male | Latin |
| Jupiter | Zeus, Father | Male | Roman |
| Kat | pure | Female | English |
| Kermit | free man | Male | Irish |
| Kiara | Italian, light, clear | Female | Spelling |
| Kirara | | Unisex | |
| Kitten | | Unisex | |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Kitty | Variant of Katherine. Pure.
| Female | English |
| Korky | | Unisex | |
| Krazy | | Unisex | Hebrew |
| Krazy Kat | | Unisex | Hebrew |