| 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. |
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