| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 521 | Thorleif | Norse | Thor's descendant. | M | |
| 522 | Thorleik | Norse | Son of Bolli. | M | |
| 523 | Thormod | Norse | Son of Odd. | M | |
| 524 | Thorolf | Norse | Thor's wolf. | M | |
| 525 | Thorstein | Norse | Thor's rock. | M | |
| 526 | Thorualdr | Norse | Thor ruler. | M | |
| 527 | Thorvald | Norse | Son of Asvald. | M | |
| 528 | Thorvid | Norse | Son of Ulfar. | M | |
| 529 | Thrand | Norse | Brother of Eyvind the Easterner. | M | |
| 530 | Thrasi | Norse | Son of Thorolf. | M | |
| 531 | Throst | Norse | Son of Hermund. | M | |
| 532 | Thrym | Norse | A mythical giant. | M | |
| 533 | Thurlow | Norse | From Thor's hill. | M | |
| 534 | Thurstan | Norse | Variant of Thurston: Thor's stone. | M | |
| 535 | Thurston | Norse | Thor's stone. | M | |
| 536 | Tiu | Norse | God of war. | M | |
| 537 | Tjasse | Norse | A mythical giant. | M | |
| 538 | Tor | Norse | God of thunder. | M | |
| 539 | Torald | Norse | Thor ruler. | M | |
| 540 | Torgeir | Norse | Spear of Thor. | M | |