| Morgian | Derived from the Old Welsh name Morgian, meaning 'sea lord'. |
| Moriddig | Derived from the Old Welsh name Moriddig, meaning 'sea warrior'. |
| Morino | Dark Skinned; Moor; Swarthy |
| Morirex | Derived from the Latin name Morirex, meaning 'sea king'. |
| Morkere | Derived from the Old English name Morkere, meaning 'dark ruler'. |
| Mormarch | Derived from the Old Welsh name Mormarch, meaning 'sea lord'. |
| Morne | Derived from the Old French name Morne, meaning 'dark' or ' gloomy'. |
| Moruarch | Derived from the Old Welsh name Moruarch, meaning 'sea lord'. |
| Mouric | Derived from the Old French name Mouric, meaning 'dark warrior'. |
| Mourici | Derived from the Latin 'mori,' meaning to die, possibly a surname for a deceased person. |
| Mucca | Italian surname meaning 'female buffalo' or 'cow,' possibly a nickname for a strong woman. |
| Mucel | Possibly a variant of the name 'Machel,' meaning 'who is like God?' |
| Mucga | Derived from the Old English 'mucga,' meaning 'battle' or 'warrior.' |
| Mundo | Wealthy; Well-advised Protector |
| Mychaell | Variant of the name 'Michael,' meaning 'who is like God?' |
| Mydnaw | Possibly a variant of the name 'Madonna,' meaning 'my lady.' |
| Mylar | A strong and resilient individual. |
| Myntla | Derived from the Old English 'myntla,' meaning 'minte' or 'mint.' |
| Myric | Derived from the Old English 'myric,' meaning 'myrtle tree.' |
| Myrsa | Possibly a variant of the name 'Marsa,' meaning 'warlike' or 'strong.' |
| Melchor | The monarch of the nation, the one who has higher authorities all over the land. |
| Mainio | Means excellent or great. |
| Majeli | God will Listen |
| Makri | Derived from a Greek name. |
| Maku | From the God Mars |
| Malakias | Messenger; Angel |
| Manne | God is with us; Great |
| Markko | From the God Mars |
| Marku | A variant of the name Mark. |
| Marttiin | From the God Mars; War-like |
| Marttiinus | From the God Mars; War-like |
| Masi | A short form of the name Matti. |
| Matiaas | A variant of the name Mathias. |
| Matikka | The Finnish word for burbot. |
| Matjus | A variant of the name Matthew. |
| Matsa | A variant of the name Matthew. |
| Matsi | A Finnish slang term for match. |
| Matsju | A variant of Matthew meaning gift. |
| Matso | A Finnish form of the name Matthew. |
| Mattero | A rare variant of the name Matteo. |