| Name | Meaning | Gender | Origin |
|---|
| Julius | after Julius Caesar | Male | Latin |
| Junior | Youthful person. Used to distinguish son from father where they have the same name | Male | Latin |
| Kalli | Energy, Black Goddess | Unisex | Hindu |
| Katana | Sword | Unisex | Japanese |
| Khatt | | Unisex | Hebrew |
| Kibbles | | Unisex | Hebrew |
| Kibbles | | Unisex | |
| Kidder | | Unisex | Hebrew |
| Kimbo | | Unisex | |
| King | King's field. King is one of several titles occasionally used as given names.
| Male | English |
| Kit | Nickname for Christopher. Frontiersman Kit Carson.
| Male | English |
| Kiwi | | Unisex | Hebrew |
| Klaus | Scandinavian and German variation of Nicolas | Male | |
| Kobe | tortoise | Male | Swahili |
| Kona | Dark rich coffee blend from Hawaii. | Unisex | |
| Koshka | Russian for kitten | Unisex | |
| Kovu | | Unisex | |
| Lady Bug | | Unisex | |
| Lancelot | Knight of Arthur and lover of Guinevere
| Male | |
| Leeloo | after the character in the movie The Fifth Element | Unisex | |
| Lemon | | Unisex | Hebrew |
| Leo | Lion.
| Male | Latin |
| Leonardo | Lion-bold. Leonardo da Vinci is considered by many to be the most brilliant and creative men who ever lived.
| Male | Italian |
| Leroy | The king.
| Male | |
| Lightning | | Unisex | Hebrew |