| Name | Meaning | Gender | Origin |
|---|
| Jasper | Black stone
| Male | Persian |
| Jasper | Black stone
| Male | Persian |
| Jeff | pledge of peace | Male | English |
| Jim | supplanter | Male | English |
| Jiminy | | Unisex | Hebrew |
| Jock | God has been gracious: has shown favor. Based on John or Jacques.
| Male | Scottish |
| John | God is merciful | Male | Hebrew |
| Joshua | God is salvation
| Male | Hebrew |
| Jumbo | Unusually large person, animal or thing e.g. Jumbo Jet. From African 'jumba' meaning elephant. | Male | |
| Junior | Youthful person. Used to distinguish son from father where they have the same name | Male | Latin |
| Kala | time, black | Unisex | |
| Kanga | | Male | Hebrew |
| Ken | Male Barbie Doll. | Male | English |
| Kenai | | Unisex | Hebrew |
| Kirby | church settlement | Male | Norse |
| Koda | | Male | |
| Kovu | | Unisex | |
| Kronk | | Unisex | Hebrew |
| Lafayette | Hound Dog from the AristoCats
| Male | |
| Lefty | Left handed person. Member of the political left. | Unisex | |
| Lenny | brave lion | Male | English |
| Lewis | Renowned fighter. Form of Louis.
| Male | English |
| Lightning Mcqueen | | Unisex | Hebrew |
| Little John | | Male | |
| Louie | renowned warrier | Male | English |