| Merefin | Derived from Old English, possibly meaning 'sea edge' or 'sea boundary'. |
| Merehwit | Old English name, possibly meaning 'bright sea' or 'shining sea'. |
| Merewala | Derived from Old English, possibly meaning 'sea guardian' or 'sea protector'. |
| Merewald | Old English name, possibly meaning 'sea ruler' or 'sea leader'. |
| Mergualdo | Derived from Old Spanish, possibly meaning 'sea guardian' or 'sea protector'. |
| Meriadok | Derived from Old English, possibly meaning 'sea ruler' or 'sea leader'. |
| Meriet | Old French name, possibly meaning 'sea gift' or 'sea treasure'. |
| Meril | A bright and shining sea spirit. |
| Merion | From Merionethshire |
| Merlan | One who dwells by the deep sea. |
| Merovius | Derived from Old English, possibly meaning 'sea warrior' or 'sea fighter'. |
| Merowald | Old English name, possibly meaning 'sea ruler' or 'sea leader'. |
| Mersi | A person who brings great mercy. |
| Merthyr | Welsh name, possibly meaning 'sea lord' or 'sea ruler'. |
| Mescagni | Italian name, possibly meaning 'great lord' or 'great ruler'. |
| Mescagnus | Derived from Italian, possibly meaning 'great lord' or 'great ruler'. |
| Metti | Italian name, possibly meaning 'gift' or 'treasure'. |
| Micheas | Hebrew name, possibly meaning 'who is like God?' or 'who is like the Lord?'. |
| Milgen | Derived from Old English, possibly meaning 'soldier' or 'warrior'. |
| Millford | Mill by the Ford |
| Millin | One who works at the flour mill. |
| Millton | Middle of Settlements; Mill Town |
| Milot | French name, possibly meaning 'soldier' or 'warrior'. |
| Milret | Derived from Old English, possibly meaning 'soldier's counsel' or 'warrior's advice'. |
| Minadoras | Spanish name, possibly meaning 'miners' or 'those who dig'. |
| Minadus | Derived from Latin, meaning 'ruler of the people' or 'leader of the masses'. |
| Minti | One who Collects his Thoughts |
| Mistar | A mysterious and hidden person. |
| Moby | Derived from the biblical name Moby, meaning 'sea' or 'ocean'. |
| Mocca | Derived from the Italian name Mocca, meaning 'young warrior'. |
| Mogan | Sensitive, Feelings |
| Mogga | Derived from the Gaelic name Mogga, meaning 'little lord'. |
| Monedorigi | Derived from the Latin name Monedorigi, meaning 'ruler of the land'. |
| Monedorix | Derived from the Latin name Monedorix, meaning 'ruler of the people'. |
| Monia | Derived from the Latin name Monia, meaning 'alone' or ' solitary'. |
| Monn | Derived from the Old English name Monn, meaning 'alone' or ' solitary'. |
| Morcant | Derived from the Old French name Morcant, meaning 'dark lord'. |
| Morcenou | Derived from the Breton name Morcenou, meaning 'sea warrior'. |
| Mordret | Derived from the Old French name Mordret, meaning 'dark ruler'. |
| Morfarch | Derived from the Old Welsh name Morfarch, meaning 'sea lord'. |