| Name | Meaning | Gender | Origin |
|---|
| Nels | Greek, people of victory | Male | Norwegian |
| Newt Scamander | | Unisex | |
| Nickleby | Nicholas's village | Male | English |
| Nightmare | A dream of intense fear or horror. | Unisex | |
| Noble | aristocratic | Male | Latin |
| Noodles | | Male | |
| Oatmeal | | Male | |
| Oboe | | Unisex | |
| Odysseus | full of wrath | Male | Greek |
| Odyssey | | Male | Hebrew |
| Oliver | The olive tree. The biblical olive tree symbolizes fruitfulness and beauty and dignity. Extending an olive branch signifies an offer of peace.
| Male | Latin |
| Omega | great | Male | Greek |
| Orvil | Gold town.
| Male | |
| Oscar | God's spear.
| Male | English |
| Osiris | with strong eyesight | Male | Egyptian |
| Otto | Born eighth or wealthy
| Male | |
| Ozzie | Strong
| Male | Short |
| Paddington | | Male | |
| Paddy | Latin, noble, patrician | Male | Irish |
| Pagan | from the country, countryman | Male | English |
| Patrick | Patrician: noble. Romans society was divided into plebeians: (commoners) and patricians: (aristocrats). Saint Patrick - patron saint of Ireland.
| Male | Latin |
| Peanut | Edible nuts eaten raw or roasted. | Unisex | |
| Pee Wee | | Unisex | |
| Peeper | | Male | Hebrew |
| Peppy | | Male | |