| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| NuallÁN | - | Ancient Irish | ||
| Nuka | - | Native American, Greenlandic | ||
| Nyazik | - | Turkmen | ||
| Nydia | NID-ee-ə (English) | English (Rare), Spanish, Literature | ||
| Nymphodora | - | Ancient Greek | ||
| Nynniaw | - | Ancient Celtic | ||
| Nyree | NIE-ree | English (New Zealand) | ||
| OŽBalt | - | Slovene | ||
| OŽBej | - | Slovene | ||
| OcÉAne | o-se-AHN | French | ||
| Ocean | O-shən | English (Rare) | ||
| Octave | - | French | ||
| Octavia | ahk-TAYV-ee-ə (English) | English, Spanish, Ancient Roman | ||
| Octavianus | - | Ancient Roman | ||
| Octavius | ahk-TAYV-ee-əs (English) | Ancient Roman |