| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 861 | Teleri | Welsh | Legendary daughter of Peul. | F | |
| 862 | Telyn | Welsh | Harp. | F | |
| 863 | Teregud | Welsh | Legendary son of Iaen. | M | |
| 864 | Terrwyn | Welsh | Brave. | F | |
| 865 | Tewdwr | Welsh | God's gift. | M | |
| 866 | Timotheus | Welsh | Welsh form of Timothy 'God given'. | M | |
| 867 | Tomos | Welsh | Twin. | M | |
| 868 | Toreth | Welsh | Abundant. | F | |
| 869 | Torlan | Welsh | From the river bank. | F | |
| 870 | Torri | Welsh | Break. | F | |
| 871 | Trahaym | Welsh | Incredibly strong. | M | |
| 872 | Trahern | Welsh | Incredibly strong. | M | |
| 873 | Tramaine | Welsh | From the big town. | M | |
| 874 | Traveon | Welsh | Fair town. Abbreviation of Trevelyan. | M | |
| 875 | Travion | Welsh | Fair town. Abbreviation of Trevelyan. | M | |
| 876 | Travon. trevon | Welsh | Fair town. Abbreviation of Trevelyan. | M | |
| 877 | Trefor | Welsh | Variant of Trevor: Large village; goodly town. | M | |
| 878 | Tremain | Welsh | From the big town. | M | |
| 879 | Tremaine | Welsh | From the big town. | M | |
| 880 | Tremayne | Welsh | Lives in the house by the rock. | M | |