| # | Name | Origin | Meaning | Gender | Save |
|---|---|---|---|---|---|
| 1 | Tadhg | Celtic | Mythical a prince of Munster. | M | |
| 2 | Taliesin | Celtic | Bard. | M | |
| 3 | Tanguy | Celtic | Fighter. | M | |
| 4 | Teaghue | Celtic | Bard. | M | |
| 5 | Teague | Celtic | Bard. | M | |
| 6 | Teithi | Celtic | Mythical son of Gwynham. | M | |
| 7 | Teyrnon | Celtic | Regal. | M | |
| 8 | Tiernan | Celtic | Regal. | M | |
| 9 | Tiernay | Celtic | Regal. | M | |
| 10 | Torrey | Celtic | Lives by the tower. | M | |
| 11 | Tory | Celtic | Lives by the tower. | M | |
| 12 | Trahern | Celtic | Strong as iron. | M | |
| 13 | Tremaine | Celtic | From the town encircled by stone. | M | |
| 14 | Tremayne | Celtic | From the town encircled by stone. | M | |
| 15 | Trevor | Celtic | Wise. | M | |
| 16 | Tris | Celtic | Diminutive of Tristan: Sad din. In a story from the Middle Ages, Tristan, nephew of King Mark of Cornwall, was in love with the princess Iseult of Ireland. | M | |
| 17 | Tristan | Celtic | Tumult; outcry. From the Celtic name Tristan. In Arthurian legend Tristan was a Knight of the Round Table and tragic hero of the medieval tale Tristram and Isolde. | M | |
| 18 | Tristen | Celtic | Tumult; outcry. From the Celtic name Tristan. In Arthurian legend Tristan was a Knight of the Round Table and tragic hero of the medieval tale Tristram and Isolde. | M | |
| 19 | Tristian | Celtic | Tumult; outcry. From the Celtic name Tristan. In Arthurian legend Tristan was a Knight of the Round Table and tragic hero of the medieval tale Tristram and Isolde. | M | |
| 20 | Tristin | Celtic | Tumult; outcry. From the Celtic name Tristan. In Arthurian legend Tristan was a Knight of the Round Table and tragic hero of the medieval tale Tristram and Isolde. | M | |