| Baby Name | Meaning | Gender |
|---|
| Mathias | "Variant Of Matthias, Biblical Name Meaning" | Male |
| Meagan | "Strong And Mighty One, Pearl" | Female |
| Medwyn | Strong Friend | Male |
| Megan | "Strong And Capable." Variant, Meghan, Exists. | Female |
| Meghan | See Megan. | Female |
| Menw | Myth Name (A Wizard) | Male |
| Mercia | From Mercia | Female |
| Meredith | Protector Of The Sea | Female |
| Merlyn | Blackbird. | Female |
| Merrick | Strong Ruler. Ruler Of Sea | Male |
| Mervin | Famous Friend | Male |
| Mervyn | Famous Friend | Male |
| Merwyn | Famous Friend | Male |
| Modron | A Goddess And Possible Precursor Of Morgan Le Fey | Female |
| Mona | Lady | Female |
| Morgan | Fighter Of The Sea | Male |
| Morgana | Legend Name | Female |
| Morgen | Morning | Female |
| Morven | Lives By The Sea | Male |
| Nia | Derived From Abbreviation Of Names With -Nia Ending. | Female |
| Nimue | The Lady Of The Lake | Female |
| Nudd | A Knight | Male |
| Nye | Island | Male |
| Olwen | Myth Name (Daughter Of Yspaddaden) | Female |
| Olwyn | Daughter Of A Giant | Female |