| Abbreviation | Definition |
|---|---|
| JHW | John H. Walker |
| JHY | John Henry |
| JIMMYV | Jim Valvano |
| JJ | Jack Jones |
| JJ | James Jordan |
| JJ | Janet Jackson |
| JJ | Jesse Jackson |
| JJ | Jessie James |
| JJ | Joan Jett |
| JJ | Joe Jarzombek |
| JJ | John Jefferson |
| JJ | Judge Judy |
| JJ | Jungle Jane |
| JJA | John James Audubon (1785-1851) |
| JJA | John Joseph Adams |
| JJAZZ | Joe Jarzombek |
| JJC | John J. Cafaro, retired CEO, Cafaro Company |
| JJK | Jackie Joyner Kersee |
| JJL | Jacob J. Leventhal |
| JJL | Jean Jacques Lussier |