| Otis | A name meaning wealthy or rich. |
| Otniel | Lion of God or God is my strength. |
| Oto | Wealth, fortune, or prosperous one. |
| Otoahhastis | Tall bull (Cheyenne) |
| Otoahnacto | Bull bear (Cheyenne) |
| Otokars | A guardian of wealth and property. |
| Otomars | Famous for his wealth and fortune. |
| Otoo | collecting sea shells in a basket |
| Otos | Keen of hearing. |
| Otsoa | A name meaning wolf in the Basque. |
| OTTAH | One who is wealthy or prosperous. |
| Ottakoothan | Name of a Poet; Poet |
| Ottar | A warrior who is feared in battle. |
| Ottavio | A name meaning the eighth in line. |
| Ottis | One who is wealthy and prosperous. |
| Otto | Born eighth or wealthy |
| Ottokar | A Germanic name meaning happy warrior. |
| Ottoway | Derived from words meaning rich friend. |
| Otugoma | King Warrior; Prince; Happiness; Strong; Superman; Hero; Excited |
| Otus | Keen of hearing. |
| Otway | An old name meaning wealthy warrior. |
| OUBASTET | myth name (cat) |
| Oudumber | A name meaning one who is very rich. |
| Oula | A name meaning one who is well born. |
| Ounslow | From the Enthusiasts Hill |
| Ouray | A name meaning the arrow or sharp one. |
| Ourson | A name meaning little bear or cub. |
| Oushig | The son of evening |
| Outram | A name meaning from the outer rim. |
| Ovadiah | Servant of the Lord God Almighty. |
| Ovadya | A Hebrew name meaning Gods servant. |
| Ovaegir | Father of the Skraeling children. |
| Ovais | A Companion of Prophet Mohammed |
| Oved | Hebrew name meaning one who serves. |
| Ovi | Holy message of marathi saint |
| Ovid | Derived from the Latin word for sheep. |
| Ovidio | A name meaning a shepherd of sheep. |
| OVIDIU | Romanian form of the name Ovidius. |
| Ovil | A name meaning a dweller of the town. |
| Ovin | A name meaning little lamb. |