| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 641 | Till | Teutonic | People's rule. | M | |
| 642 | Tillmann | Teutonic | People's rule. | M | |
| 643 | Tilman | Teutonic | People's rule. | M | |
| 644 | Tirell | Teutonic | Martial ruler. | M | |
| 645 | Torbert | Teutonic | Glorious as Thor. | M | |
| 646 | Torkel | Teutonic | From Thor's cauldron. | M | |
| 647 | Tormod | Teutonic | From the north. | M | |
| 648 | Torquil | Teutonic | From Thor's cauldron. | M | |
| 649 | Torsten | Teutonic | Thor's stone. | M | |
| 650 | Traugott | Teutonic | God's truth. | M | |
| 651 | Tyfiell | Teutonic | Derivative of the Scandinavian god of battle 'Tyr.' Tuesday was named for Tyr. | M | |
| 652 | Tyreece | Teutonic | Derivative of the Scandinavian god of battle 'Tyr.' Tuesday was named for Tyr. | M | |
| 653 | Tyrel | Teutonic | Derivative of the Scandinavian god of battle 'Tyr.' Tuesday was named for Tyr. | M | |
| 654 | Tyrell | Teutonic | Derivative of the Scandinavian god of battle 'Tyr.' Tuesday was named for Tyr. | M | |
| 655 | Tyrelle | Teutonic | Derivative of the Scandinavian god of battle 'Tyr.' Tuesday was named for Tyr. | M | |
| 656 | Tyson | Teutonic | Son of a German. | M | |
| 657 | Ubert | Teutonic | Intelligent. | M | |
| 658 | Udo | Teutonic | Universal ruler. | M | |
| 659 | Ugo | Teutonic | Spirit. | M | |
| 660 | Uherto | Teutonic | Intelligent. | M | |