| Name | Gender | Pronounced | Usage | Popularity |
|---|---|---|---|---|
| Neifion | - | Welsh | ||
| Neirin | - | Welsh | ||
| Nerys | - | Welsh | ||
| Nest | - | Welsh | ||
| Nesta | - | Welsh | ||
| Nia (1) | - | Welsh | ||
| Non | - | Welsh | ||
| Nudd | - | Welsh Mythology | ||
| Nye | - | Welsh | ||
| Ofydd | - | Welsh | ||
| Olwen | - | Welsh | ||
| Olwin | - | Welsh | ||
| Olwyn | - | Welsh | ||
| Owain | O-wien (Welsh, Welsh Mythology) | Welsh, Welsh Mythology, Arthurian Romance | ||
| Owen (1) | O-ən (English) | Welsh, English |