| Abbreviation | Definition |
|---|---|
| AJ | Angina Jacintha |
| AJ | Anna Jane |
| AJ | Anna Josephine |
| AJ | Annalise Jean |
| AJ | Another Jeff |
| AJ | Anthony James |
| AJ | Anthony Jason |
| AJ | Anthony John |
| AJ | Anthony Jordan |
| AJ | Anthony Joseph |
| AJ | Anthony, Junior |
| AJ | Anton Junior |
| AJ | Antonio Joaquin |
| AJ | Antonio Julius |
| AJ | Arlin Jr |
| AJ | Arnold Jesse |
| AJ | Arska Junior |
| AJ | Ashley Jordan |
| AJ | Aspen Junior |
| AJ | Ass Jockey |