| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 661 | Nefen | German | Nephew. | M | |
| 662 | Neff | German | Nephew. | M | |
| 663 | Nefin | German | Nephew. | M | |
| 664 | Nickolaus | German | Victorious; conquerer of the people. Variant of Nicholas. | M | |
| 665 | Nikolaus | German | Victorious; conquerer of the people. Variant of Nicholas. | M | |
| 666 | Norbert | German | Shining from the North. | M | |
| 667 | Norberto | German | Shining from the North. | M | |
| 668 | Norman | German | Man from the North. Vikings that settled in France were called Normans (hence the Normandy region of France). | M | |
| 669 | Normand | German | Man of the north. Surname. | M | |
| 670 | Oates | German | Variant of Odo: Wealth. | M | |
| 671 | Oberon | German | Noble and bear-like. In a Midsummer Night's Dream, Shakespeare altered the spelling of Auberon (King of the fairies) to Oberon. | M | |
| 672 | Odbart | German | Wealthy. | M | |
| 673 | Oddie | German | Variant of Odo: Wealth. | M | |
| 674 | Odhert | German | Wealthy. | M | |
| 675 | Odo | German | Wealth. | M | |
| 676 | Oliver | German | Elf army. Can also be a variant of Olaf: Relic, ancestral heritage. | M | |
| 677 | Olivier | German | Variant of Oliver: Elf army. Can also be a variant of Olaf: Relic, ancestral heritage. | M | |
| 678 | Ollie | German | Diminutive of Oliver: Elf army. Can also be a variant of Olaf: Relic, ancestral heritage. | M | |
| 679 | Orbart | German | Wealthy. | M | |
| 680 | Orbert | German | Wealthy. | M | |