| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 441 | Teague | Celtic | Bard. | M | |
| 442 | Teithi | Celtic | Mythical son of Gwynham. | M | |
| 443 | Teyrnon | Celtic | Regal. | M | |
| 444 | Tiernan | Celtic | Regal. | M | |
| 445 | Tiernay | Celtic | Regal. | M | |
| 446 | Torrey | Celtic | Lives by the tower. | M | |
| 447 | Tory | Celtic | Lives by the tower. | M | |
| 448 | Trahern | Celtic | Strong as iron. | M | |
| 449 | Tremaine | Celtic | From the town encircled by stone. | M | |
| 450 | Tremayne | Celtic | From the town encircled by stone. | M | |
| 451 | Trevor | Celtic | Wise. | M | |
| 452 | 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 | |
| 453 | 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 | |
| 454 | 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 | |
| 455 | 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 | |
| 456 | 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 | |
| 457 | Tristram | Celtic | Variant 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 | |
| 458 | Turi | Celtic | Bear. | M | |
| 459 | Varden | Celtic | From the green hill. | M | |
| 460 | Vardon | Celtic | From the green hill. | M | |