Sorted alphabetically by last name · 2769 fighters
| Name | Nickname | |
|---|---|---|
| JM | Johnny Munoz | "Kid Kvenbo" |
| JR | Johnny Rees | "The Hater Hurter" |
| JR | Johnny Rhodes | |
| JW | Johnny Walker | |
| JH | Johny Hendricks | "Bigg Rigg" |
| JD | Jon Delos Reyes | "The Heat" |
| JF | Jon Fitch | |
| JH | Jon Hess |
| JJ | Jon Jones | "Bones" |
| JM | Jon Madsen |