| Name | Meaning | Gender | Origin |
|---|
| Moselle | taken from water | Female | Hebrew |
| Muireann | Long haired
| Female | Irish |
| Muirgheal | Knows the sea
| Female | |
| Murdock | victorious at sea | Unisex | |
| Muriel | myrrh; sea-bright; angel of June | Female | Irish |
| Murphy | Sea warrior | Male | Irish |
| Murray | The mariner, sailor | Male | Scottish |
| Nemo | from the glen | Male | Greek |
| Neptune | | Male | |
| Nerida | Aboriginal for red water lily | Female | Greek |
| Njord | Viking mythology: the god of wind and sea | Male | Scandinavian |
| Ocean | | Male | |
| Orman | spearman | Unisex | |
| Pasha | small | Male | Russian |
| Perseus | | Male | |
| Polly | Bitter
| Female | English |
| Polly | Bitter
| Female | English |
| Poppy | Flower with four crumpled petals in red, orange or white colours | Female | Latin |
| Poppy | Flower with four crumpled petals in red, orange or white colours | Female | Latin |
| Poseidon | | Male | |
| Quincy | Fifth: derived from Roman clan name.
| Male | |
| Ran | Lily, Purity | Unisex | Japanese |
| Rosemary | the rosemary plant | Female | Latin |
| Scylla | | Unisex | Hebrew |
| Seal | | Male | |