| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Nollaig | NAWL-əg | Irish | ||
| Nora | NAWR-ə (English), NO-rah (German) | Irish, English, Swedish, Norwegian, Danish, German, Dutch, Italian | ||
| Norah | NAWR-ə | Irish, English | ||
| Noreen | nawr-EEN | Irish, English | ||
| Norene | nawr-EEN | Irish, English | ||
| Nuada | - | Irish Mythology | ||
| Nuadha | - | Irish Mythology | ||
| Nuala | NOO-ə-lah | Irish | ||
| NuallÁN | - | Ancient Irish | ||
| Odharnait | - | Irish | ||
| OdhrÁN | O-rawn | Irish | ||
| Odran | - | Irish | ||
| OisÍN | OSH-een, USH-een | Irish, Irish Mythology | ||
| OnÓRa | - | Irish | ||
| Oona | OO-na (Irish), O:-nah (Finnish) | Irish, Finnish |