| Rolli | Powerful Ruler; Famous Landowner |
| Romildo | A glorious and famous ruler. |
| Ronelo | Famous ruler, a name with Spanish and Italian origins, meaning renowned leader. |
| Rouven | Behold, a son is born. |
| Roxelio | A bright and famous warrior. |
| Ruedi | A famous and noble wolf. |
| Ruediger | Famous spear, a name with Germanic origins, meaning famous warrior. |
| Ruland | Famous Throughout the Land |
| Ruud | A famous wolf or glorious hero. |
| Ruven | Behold, a son has been born now. |
| Rylle | Strong and brave, a name with English and Celtic roots, meaning courageous. |
| Tabi | A person who is a traveler. |
| Tabo | Staff of the Goths |
| Tancredi | Advice; Counsel |
| Tayfun | Storm, a name with Turkish and Arabic origins, meaning turbulent and powerful. |
| Tayyar | Current; Wind; Title of Jafar |
| Tedor | Gift from God; Divine Gift |
| Teobald | A bold and daring people ruler. |
| Teobaldo | Courageous People; Pearl |
| Terryll | Following Thor; The God of Thunder |
| Tewdor | A chief of the local people. |
| Tibold | A Bold Leader of the People |
| Tihamer | Strong and mighty, a name with Hungarian and Slavic roots, meaning robust and fearless. |
| Tillo | Ruler of the People; Race; People |
| Tilmann | A man of good character. |
| Tilo | Derived from the word people. |
| Tipp | Courageous Race |
| Tjalf | The People's Descendant |
| Tobby | God is my gracious provider. |
| Tobe | The Lord is Good |
| Tobi | God is my gracious master. |
| Tobiasz | God is my gracious savior. |
| Tolga | Derived from Turkish, means 'victory' or 'conqueror' |
| Trajce | Slavic origin, means 'warrior' or 'bringer of victory' |
| Tugay | A warrior of the mountain. |
| Turker | Turkish origin, means 'Turk' or 'from Turkey' |
| Tychon | One who hits the target. |
| Regulus | Meaning a small or petty king. |
| Rehor | Awake; Watchful |
| Rheo | Derived from the Greek for flowing. |