| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 201 | Merrion | Welsh | Variant of Meirion: Name derived from the old county of Merionethshire. | F | |
| 202 | Merry | Welsh | Diminutive of Meredith: Magnificent. Great chief. Great lady. Used for both genders, but most common among girls. | F | |
| 203 | Modlen | Welsh | Welsh form of Magdalene: tower. | F | |
| 204 | Morcan | Welsh | Bright sea. | F | |
| 205 | Morgaine | Welsh | Bright sea. | F | |
| 206 | Morgan | Welsh | Bright sea. From the shore of the sea. Morgan le Fay was sorceress and sister to King Arthur in Arthurian legend. | F | |
| 207 | Morgana | Welsh | From the shore of the sea. | F | |
| 208 | Morgann | Welsh | Bright sea. | F | |
| 209 | Morgant | Welsh | From the shore of the sea. | F | |
| 210 | Morvudd | Welsh | Legendary daughter of Uryen. | F | |
| 211 | Morwenna | Welsh | Maiden; sea wave. | F | |
| 212 | Myfanawy | Welsh | My fine, rare one. | F | |
| 213 | Myfanwy | Welsh | My fine, rare one. | F | |
| 214 | Nerys | Welsh | Lord. | F | |
| 215 | Neued | Welsh | Legendary daughter of KyvwIch. | F | |
| 216 | OIwyna | Welsh | White foot print. | F | |
| 217 | Olwen | Welsh | White footprint. In 'Culhwch and Olwen', one of the Welsh stories from the 'Maginogion', the Olwen were white flowers growing in the heroine's footprints. | F | |
| 218 | Olwina | Welsh | White foot print. | F | |
| 219 | Olwyn | Welsh | Variant of Olwen: White footprint. In 'Culhwch and Olwen', one of the Welsh stories from the 'Maginogion', the Olwen were white flowers growing in the heroine's footprints. | F | |
| 220 | Owena | Welsh | Feminine form of Owen: Young warrior. Also can be a variant of Eugene: Well-born. | F | |