| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 641 | Nichol | French | Feminine of Nicholas 'people's victory.'. | M | |
| 642 | Nicolas | French | Victorious; conquerer of the people. Variant of Nicholas. | M | |
| 643 | Noel | French | Christmas. | M | |
| 644 | Noell | French | Birthday. Feminine of Noel. Commonly refers to Christ's birth and Christmas festival. | M | |
| 645 | Noreis | French | Caretaker. | M | |
| 646 | Norice | French | Caretaker. | M | |
| 647 | Norm | French | From the north. | M | |
| 648 | Norman | French | From the north. | M | |
| 649 | Normand | French | From the north. | M | |
| 650 | Norris | French | Caretaker; nurse. Most often found as a surname. | M | |
| 651 | Nouel | French | Akernel. | M | |
| 652 | Octave | French | Born eighth. | M | |
| 653 | Odo | French | Name of a bishop. | M | |
| 654 | Oliver | French | The olive tree. The biblical olive tree symbolizes fruitfulness and beauty and dignity. Extending an olive branch signifies an offer of peace. | M | |
| 655 | Olivier | French | From the olive tree. | M | |
| 656 | Ollie | French | Diminutive of Oliver: Olive tree. | M | |
| 657 | Onfroi | French | PeacefuI Hun. | M | |
| 658 | ONille | French | From the gold town. | M | |
| 659 | Orson | French | Bear cub. Famous Bearer: American actor/director Orson Welles. | M | |
| 660 | Orval | French | 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. | M | |