| Name | # Entries |
|---|---|
| Treschman | 5 |
| Treseder | 42 |
| Tresler | 1 |
| Tresoglavic | 6 |
| Tresoldi | 2 |
| Tressa | 0 |
| Tressos | 4 |
| Treston | 20 |
| Tret | 0 |
| Trethan | 3 |
| Tretheway | 16 |
| Trethewey | 89 |
| Trudy | 16 |
| Trueber | 2 |
| Truebody | 9 |
| Tudberry | 3 |
| Tudd | 1 |
| Tudgey | 19 |
| Tudini | 10 |
| Tu Do | 1 |
| Tragaris | 6 |
| Tragear | 11 |
| Trafalski | 4 |
| Trafford | 8 |
| Tragiannidis | 2 |
| Tragotsalos | 4 |
| Tragoustis | 1 |
| Trahorsch | 1 |
| Trai | 29 |
| Traianou | 6 |
| Traicos | 6 |
| Trail | 45 |
| Tiang | 16 |
| Tiani | 12 |
| Tianna | 1 |
| Tiary | 0 |
| Tibbey | 24 |
| Tiatto | 4 |
| Tibbles Jones | 0 |
| Texeira | 5 |
| Texier | 8 |
| Teychenne | 17 |
| Teymouri | 0 |
| Teys | 67 |
| Tezacker | 3 |
| Tezzele | 2 |
| Thabanabath | 0 |
| Thabrew | 1 |
| Tame | 141 |
| Tameev | 1 |
| Tamei | 1 |
| Tameifuna | 2 |
| Tamerji | 1 |
| Tamie | 0 |
| Tamihana | 17 |
| Tamimi | 11 |
| Tamindzic | 2 |
| Tamigi | 1 |
| Taminaya | 2 |
| Tamjarion | 1 |
| Tamme | 12 |
| Tammekand | 5 |
| Tammerijn | 1 |
| Tammelo | 1 |
| Tammett | 3 |
| Tamminga | 3 |
| Tammo | 2 |
| Took | 36 |
| Tobar Lecaros | 0 |
| Tobbagi | 0 |
| Toben | 0 |
| Tobey | 0 |
| Tobgui | 6 |
| Tobgi | 1 |
| Tobiasz | 6 |