| Name | Meaning | Gender | Origin |
|---|
| Jewel | Jewel
| Female | Word |
| Jock | God has been gracious: has shown favor. Based on John or Jacques.
| Male | Scottish |
| Jodie | From Judith - Admired and praised | Unisex | |
| Jonah | Dove. In the bible Jonah was on board a ship God caused to sink: sailors traditionally use the name Jonah to personify someone who brings bad luck.
| Male | Hebrew |
| Jordan | The descending river, to flow | Male | Hebrew |
| Julia | Youthful
| Female | Latin |
| Julie | Youthful: Jove's child. A feminine of Julian.
| Female | |
| Junior | Youthful person. Used to distinguish son from father where they have the same name | Male | Latin |
| Justine | just, true | Female | |
| Katarina | pure | Female | Czech |
| Kato | second of twins | Male | African |
| Kelly | Lively: aggressive.
| Female | Irish |
| Kenny | English, born of fire, handsome | Male | English |
| Kentucky | | Unisex | |
| Kiki | From Enriqueta - Pet | Female | |
| Kiki | From Enriqueta - Pet | Female | |
| Kirby | church settlement | Male | Norse |
| Kirsten | christian; stone church | Female | Scandinavian |
| Kobe | tortoise | Male | Swahili |
| Lafayette | Hound Dog from the AristoCats
| Male | |
| Lance | knight's attendant; land | Male | English |
| Lancelot | Knight of Arthur and lover of Guinevere
| Male | |
| Laptop | | Unisex | |
| Lara | citadel | Female | Russian |
| Larisa | Citadel | Female | Russian |