| Meaning | heart, courageous |
| Origin | Greek |
| Gender | Boy |
| Popularity | Moderate |
| Length | 4 |
| Syllables | 1 |
| Syllabification | Thad |
| Thadeaus |
| Thaddeus |
| Thadius |
| Thaddius |
| Taddeus |
| Thady |
| Thade |
| Thaddy |
| Tad |
| Thaddeo |
| Thadeus |
| Tadeo |
| Theodore |
| Thomas |
| Thaddeus |
| Theo |
| Timothy |
| Thurston |
| Thatcher |
| Thornton |
| Thurman |
| Theobald |
| Thayer |
| Thor |
| Ted |
| Tad |