| Name | Meaning | Gender | Origin |
|---|
| Mortimer | Dead sea | Male | French |
| Morty | Dead sea | Male | French |
| Morven | Lives By The Sea | Male | English |
| Morwen | Maid | Female | Welsh |
| Morwenna | Maid | Female | Welsh |
| Moselle | Out of the water | Female | Hebrew |
| Moses | Drawn out of the water | Male | Hebrew |
| Moshe | Drawn out of the water | Male | Hebrew |
| Moss | Drawn out of the water | Male | Hebrew |
| Muna | Hope | Female | Arabic |
| Murdock | Sea | Male | Gaelic |
| Muriel | Bright as the sea | Female | Gaelic |
| Murphy | Sea warrior | Male | Gaelic |
| Murray | Man of the sea | Male | Gaelic |
| Myra | Uncertain, perhaps myrrh, unguent | Female | Latin |
| Nadia | Hope | Female | Russian |
| Naia | Flowing/Blossom | Female | English |
| Naida | As a water nymph | Female | Greek |
| Nairne | Dwells At The Alder Tree River | Female | English |
| Naiya | An inland vessel | Female | Indian |
| Nalin | Lotus Flower | Unisex | Hindu |
| Namazzi | Water | Female | African |
| Nami | Of great reknown | Female | Sanskrit |
| Namiko | Wave child | Female | Japanese |
| Nana | Grace | Unisex | Hebrew |
| Nanda | Uncertain, perhaps peaceful venture | Female | German |
| Narmada | She who gives pleasure | Female | Sanskrit |
| Nasiche | Given life during the locust season | Female | African |
| Neeharika | | Female | Hebrew |
| Neha | Cherished, beauty | Female | Indian |