| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Niall | NEE-al, NIE-al | Irish, Scottish | ||
| Niamh | NEEV | Irish, Irish Mythology | ||
| Ninian | - | Scottish, Irish, Ancient Celtic | ||
| NioclÁS | NIK-lahs | Irish | ||
| Nola | NO-lə | English, Irish | ||
| Nolan | NO-lan | Irish, English | ||
| 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 |