Sorted alphabetically by last name · 2715 fighters
| Name | Nickname | |
|---|---|---|
| JY | Ji Yeon Kim | "Firefist" |
| JY | Jianping Yang | |
| JA | Jim Alers | "The Beast" |
| JM | Jim Miller | "A-10" |
| JM | Jim Mullen | |
| JW | Jim Wallhead | "Judo" |
| JM | Jimi Manuwa | "Poster Boy" |
| JR | Jimmie Rivera | "El Terror" |
| JC | Jimmy Crute | |
| JF | Jimmy Flick | "The Brick" |