| # | Name | Origin | Meaning | Gender | Save |
| 851 | Taithleach | Gaelic | Quiet. | M | ![]() |
| 852 | Tara | Gaelic | From the crag of a tower. | F | ![]() |
| 853 | Teague | Gaelic | Poet. | M | ![]() |
| 854 | Tearlach | Gaelic | Manly. | M | ![]() |
| 855 | Tearley | Gaelic | Manly. | M | ![]() |
| 856 | Tearly | Gaelic | Manly. | M | ![]() |
| 857 | Teimhnean | Gaelic | Dark. | M | ![]() |
| 858 | Terrence | Gaelic | From the knolls. | M | ![]() |
| 859 | Thornton | Gaelic | Town of thorns. Thorn variants are English surnames occasionally used as given names. | M | ![]() |
| 860 | Tioboid | Gaelic | Bold. | M | ![]() |
| 861 | Tomas | Gaelic | Twin. | M | ![]() |
| 862 | Tormod | Gaelic | From the north. | M | ![]() |
| 863 | Torrance | Gaelic | From the knolls. | M | ![]() |
| 864 | Trina | Gaelic | Diminutive of Catriona, a Scottish Gaelic variant of Catherine meaning meaning pure, clear. | F | ![]() |
| 865 | Tuathal | Gaelic | Peaceful. | M | ![]() |
| 866 | Tulley | Gaelic | Peaceful. | M | ![]() |
| 867 | Tully | Gaelic | Peaceful. | M | ![]() |
| 868 | Tynan | Gaelic | Dark. | M | ![]() |
| 869 | Uilleam | Gaelic | Helmeted. | M | ![]() |
| 870 | Uisdean | Gaelic | Intelligent. | M | ![]() |
| 871 | Una | Gaelic | Gaelic forms of Agnes. | F | ![]() |