| Name | Meaning | Gender | Origin |
|---|
| Joe | Abbreviation of Joseph.
| Male | English |
| Joe | Abbreviation of Joseph.
| Male | English |
| Joey | Abbreviation of Joseph.
| Male | |
| Joey | Abbreviation of Joseph.
| Male | |
| Johnny | the Lord is gracious | Male | English |
| 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 |
| Joplin | the afflicted | Male | English |
| Jujube | | Unisex | Hebrew |
| Junior | Youthful person. Used to distinguish son from father where they have the same name | Male | Latin |
| Jupiter | Zeus, Father | Male | Roman |
| Kala | time, black | Unisex | |
| Kanga | | Male | Hebrew |
| Kenai | | Unisex | Hebrew |
| Kirby | church settlement | Male | Norse |
| Kit | Nickname for Christopher. Frontiersman Kit Carson.
| Male | English |
| Kiwi | | Unisex | Hebrew |
| Kobe | tortoise | Male | Swahili |
| Koda | | Male | |
| Kola | | Unisex | Hebrew |
| Kovu | | Unisex | |
| Krusty | after Krusty the Clown from The Simpsons | Unisex | |
| Lafayette | Hound Dog from the AristoCats
| Male | |
| Larry | Abbreviation of Lawrence or Laurence often used as an independent name.
| Male | English |
| Leia | Weary | Unisex | Hebrew |
| Lemon | | Unisex | Hebrew |