Here is a selection of some popular names for cats which all start with the letter J.
| Jabba | Jeffrey | Jo |
| Jabberwocky | Jekyll | Joe |
| Jacco | Jelly | Joey |
| Jackie | Jellybean | Johnny |
| Jackpot | Jem | Jojo |
| Jacob | Jemima | Joker |
| Jade | Jenna | Jonah |
| Jaguar | Jennifer | Jonas |
| Jake | Jenny | Jordan |
| Jamaica | Jensen | Joseph |
| James | Jeremiah | Josey |
| Jamie | Jericho | Joshua |
| Jasmine | Jesper | Josie |
| Jason | Jess | Joss |
| Jasper | Jessica | Jude |
| Java | Jet | Juice |
| Jaws | Jethro | Juilet |
| Jay | Jezebel | Juju |
| Jazz | Jiffy | Jules |
| Jazz Cat | Jim Bob | Julian |
| Jazzie | Jimi | Juliet |
| Jazzman | Jingo | Juliette |
| Jazzy | Jinksey | Julius |
| Jeanluc | Jinx | Jumbo |
| Jeepers | Jinxy | Junior |
| Jeeves | Jitters | Jurgen |