| # | Name | Origin | Meaning | Gender | |
|---|---|---|---|---|---|
| 721 | Morrison | Scottish | Son of the servant of Mary. | M | |
| 722 | Mufidy | Scottish | Man of the sea. | M | |
| 723 | Muir | Scottish | From the moor. | M | |
| 724 | Muira | Scottish | From the moor. | F | |
| 725 | Muire | Scottish | Bitter or from the moor. | F | |
| 726 | Muirfinn | Scottish | DweIls near the beautiful sea. | M | |
| 727 | Munro | Scottish | Man from Ro. | M | |
| 728 | Munroe | Scottish | Man from Ro. | M | |
| 729 | Murdoc | Scottish | Protector of the sea. | M | |
| 730 | Murdoch | Scottish | Protector of the sea. | M | |
| 731 | Murdock | Scottish | Protector of the sea. | M | |
| 732 | Murray | Scottish | From the sea. Ancient Scottish clan surname. | M | |
| 733 | Mysie | Scottish | Variant of Maisie: Scottish Diminutive form of Margaret: Pearl, child of light. | F | |
| 734 | Nab | Scottish | Abbot. | M | |
| 735 | Nachton | Scottish | Pure. | M | |
| 736 | Nairna | Scottish | Dwells at the alder tree river. | F | |
| 737 | Nairne | Scottish | Dwells at the alder tree river. | F | |
| 738 | Nairne | Scottish | From the alder - tree river. | M | |
| 739 | Nathair | Scottish | Snake. | M | |
| 740 | Nathaira | Scottish | Snake. | F | |