| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 221 | Nola | Celtic | Famous. | F | |
| 222 | Oifa | Celtic | Mythical sister of Ove. | F | |
| 223 | Oilell | Celtic | A mythical queen. | F | |
| 224 | Olwen | Celtic | Mythical daughter of Yspaddaden. | F | |
| 225 | Olwyn | Celtic | Mythical daughter of Yspaddaden. | F | |
| 226 | Oriana | Celtic | Blond. | F | |
| 227 | Ove | Celtic | Mythical daughter of Dearg. | F | |
| 228 | Penarddun | Celtic | Mythical daughter of Beli. | F | |
| 229 | Reaghan | Celtic | Nobility. | F | |
| 230 | Regan | Celtic | Nobility. | F | |
| 231 | Rhiannon | Celtic | Mythical daughter of Hefeydd. | F | |
| 232 | Ronat | Celtic | Seal. | F | |
| 233 | Rowena | Celtic | White or comely. | F | |
| 234 | Selma | Celtic | Comely. | F | |
| 235 | Ula | Celtic | Sea jewel. | F | |
| 236 | Una | Celtic | White wave. | F | |
| 237 | Venetia | Celtic | Blessed. | F | |
| 238 | Winnie | Celtic | White or fair. | F | |
| 239 | Wynne | Celtic | White or fair. | F | |
| 240 | Wynnie | Celtic | White or fair. | F | |