| French baby names begining from O |
| Octave |
 | Born eighth. |
| Odeletta |
 | Little spring. |
| Odelette |
| Little spring. |
| Odette |
| Wealthy. |
| Odila |
| Wealthy. |
| Odile |
| Wealthy. |
| Odo |
| Name of a bishop. |
| Oliver |
| The olive tree. The biblical olive tree symbolizes fruitfulness and beauty and dignity. Extending an olive branch signifies an offer of peace. |
| Olivier |
| From the olive tree. |
| Ollie |
 | Diminutive of Oliver: Olive tree. |
| Olympe |
| From Olympus. |
| Olympia |
| From Olympus. |
| Onfroi |
| PeacefuI Hun. |
| ONille |
| From the gold town. |
| Ophelia |
| Serpentine. |
| Ophelie |
| Serpentine. |
| Orane |
| Rising. |
| Oriel |
| Bird. |
| Orlena |
| Gold. |
| Orlene |
| Gold. |
| Orlina |
| Gold. |
| Orson |
| Bear cub. Famous Bearer: American actor/director Orson Welles. |
| Orva |
| Worth gold. |
| Orval |
| Variant of Orville: Gold town. Famous Bearer: aviator Orville Wright (1871-1948) who (along with his brother Wilbur) designed and built the first true airplane. |
| Orvelle |
| Gold town. |
| Orvil |
| Gold town. |
| Orville |
| Gold town. Famous Bearer: aviator Orville Wright (1871-1948) who (along with his brother Wilbur) designed and built the first true airplane. |
| Ourson |
| Little bear. |
| |
