| Name | Meaning | Gender | Origin |
|---|
| Ivan | Form of John | Male | Russian |
| Jackie | supplanter | Female | English |
| Jerry | after Jerry Garcia, The Grateful Dead | Male | English |
| 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 |
| Junior | Youthful person. Used to distinguish son from father where they have the same name | Male | Latin |
| Justine | just, true | Female | |
| Kato | second of twins | Male | African |
| Kelly | Lively: aggressive.
| Female | Irish |
| Kiki | From Enriqueta - Pet | Female | |
| Kiki | From Enriqueta - Pet | Female | |
| Kirby | church settlement | Male | Norse |
| Kirsten | christian; stone church | Female | Scandinavian |
| Lance | knight's attendant; land | Male | English |
| Laptop | | Unisex | |
| Lara | citadel | Female | Russian |
| Larisa | Citadel | Female | Russian |
| Larry | Abbreviation of Lawrence or Laurence often used as an independent name.
| Male | English |
| Layla | night | Female | Arabic |
| Layla | night | Female | Arabic |
| Lebron | brown-haired one | Male | |
| Leslie | dweller in the gray castle; small meadow | Female | Scottish |
| Lexi | Greek, feminine form of Alexander, defending men | Female | English |