| Abbreviation | Definition |
|---|---|
| JD | Joshua David |
| JD | Judy Denise |
| JD | Just Dog |
| JDRT | Joel Davis Rhys Thomas |
| JDSC | Jackie Daly, Séamus Creagh |
| JDY | Judy |
| JEAN | Jeanette |
| JEFF | Jefferson |
| JEN | Jennifer |
| JENNIE | Jennifer |
| JERRY | Jeremiah |
| JF | Jean-François |
| JF | John Francis |
| JFRY | Jeffrey |
| JFX | The Jones Falls Expressway |
| JG | Joan Grace |
| JI | John Isaac |
| JIW | Journeyman Iron Worker |
| JJ | Jabber Jaws |
| JJ | Jacob Jon |