| Mavoheni | Great warrior or noble warrior |
| Mayew | Great lord or noble lord |
| Maykn | Great battle or great war |
| Meapa | Battle lord or lord of battle |
| Meappa | Battle lord or lord of battle |
| Mearcred | Famous spear or famous warrior |
| Mearna | Famous lord or noble lord |
| Mearth | Great earth or noble earth |
| Mearthel | Great battle or great war |
| Mede | One who is a meadow or field. |
| Medelant | Praise lord or lord of praise |
| Medgaud | Praise battle or battle of praise |
| Medraut | Praise ruler or noble ruler |
| Meilros | Sea lord or lord of the sea |
| Meilyr | A man who is a chief or leader. |
| Meirchiawn | Sea battle or battle of the sea |
| Melburne | Border; Mill Stream |
| Melda | A woman who is fair and gentle. |
| Meleagrant | Battle lord or lord of battle |
| Meledisant | Battle praise or praise of battle |
| Melehan | Derived from Welsh, possibly meaning 'blessed' or 'holy' |
| Meliagrant | Possibly derived from Greek, meaning 'honey-seller' or 'honey-sweet' |
| Meliance | Derived from French, meaning 'honey-like' or 'sweet' |
| Melias | Derived from Greek, meaning 'honey' or 'sweet' |
| Melion | Derived from Greek, meaning 'honey' or 'sweet' |
| Meliot | Derived from French, meaning 'honey-like' or 'sweet' |
| Melisus | Derived from Greek, meaning 'honey' or 'sweet' |
| Melvan | A friend who is a brave chief. |
| Melvine | A trusted friend or counselor. |
| Mencius | Derived from Chinese, meaning 'great brightness' or 'great light' |
| Mensige | Derived from Old English, meaning 'gift of God' or 'divine gift' |
| Menta | Derived from Latin, meaning 'mint' or 'peppermint' |
| Meoc | Derived from Old English, meaning 'bitter' or 'sour' |
| Meraugis | Derived from Old French, meaning 'sea warrior' or 'sea fighter' |
| Merchbiu | Derived from Old Welsh, meaning 'sea lord' or 'sea ruler' |
| Merchelm | Derived from Old English, meaning 'sea helmet' or 'sea protection' |
| Merchfyw | Derived from Old Welsh, meaning 'sea lord' or 'sea ruler' |
| Merchguinus | Derived from Old Welsh, meaning 'sea lord' or 'sea ruler' |
| Merchiaun | Derived from Old Welsh, meaning 'sea lord' or 'sea ruler' |
| Merchion | Derived from Old Welsh, meaning 'sea lord' or 'sea ruler' |