| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Norris | NAWR-is | English | ||
| Norton | NAWR-tən | English | ||
| Norwood | NAWR-wuwd | English | ||
| Nova | NO-və | English | ||
| Nowell | - | English (Rare) | ||
| Nydia | NID-ee-ə (English) | English (Rare), Spanish, Literature | ||
| Nyree | NIE-ree | English (New Zealand) | ||
| Ocean | O-shən | English (Rare) | ||
| Octavia | ahk-TAYV-ee-ə (English) | English, Spanish, Ancient Roman | ||
| Ode | - | Medieval English | ||
| Odelia | - | English | ||
| Odell | o-DEL | English | ||
| Odetta | - | English (Rare) | ||
| Odin | O-din | Norse Mythology, English (Modern) | ||
| Ogden | AWG-dən | English |