| Abbreviation | Definition |
|---|---|
| JR | John Romeo |
| JR | Junior |
| JR | Justin Randall |
| JRR | John Ronald Reuben |
| JS | Joe Schmoe |
| JS | Justin Simon |
| JSR | Jai Shri Ram |
| JT | Jack Thomas |
| JT | James Taylor |
| JT | James Thomas |
| JT | James Tiberius |
| JT | James Timothy |
| JT | Jamie Thomas |
| JT | Janna Theresa |
| JT | Jarrett Travis |
| JT | Jason Todd |
| JT | Jeffrey Thomas |
| JT | Jeffrey Todd |
| JT | Jerome Terrence |
| JT | John Tack |