| Family Name |
Gaelic Equivalent |
Original Language |
English Translation |
| Mackey | � Maca | Manu forti. | With a strong hand |
| Madden | � Mad�in | Christo duce vincamus. | With Christ I will conquer |
| Maher | � Meacair | In periculis audax. | Bold in dangers |
| Mc Mahon | Mac Mat�na | Sic nos sic sacra tuemur. | Thus we guard our sacred rights |
| O'Mahony | � Mat�na | Lasair romuin go buad. | The torch before us triumphantly |
| O'Malley | � M�ille | Terra marique potens. | Valiant by sea and land |
| Mallon | � Meall�in | | Brave and faithful |
| Malone | � Maoileoin | Fidelis ad urnam. | Faithful to the tomb |
| Mangan | � Mong�in | Manus hoec inimica tyrannis. | This hand is hostile to tyrants |
| Manley | � M�inle | Manus hoec inimica tyrannis. | This hand is hostile to tyrants. |
| Manning | � Mainnin | Viva ut vivas. | Live that you may live forever. |
| Mc Manus | Mac M�nais | Cor et manus. | Heart and hand. |
| Marshall | Marascal | Utilem pete finem. | Seek a useful end. |
| Martin | � Mairt�n | Auxilium meum a Domino. | My help is from the Lord. |
| Mason | Mas�n | Demeure par la v�rit�. | Stick by the truth. |
| Masterson | Mac An M�istir | Per ardua. | Through difficulties. |
| Mathews | Maiti� | Deo adjuvante non timendum. | With God assisting we must not fear. |
| Maxwell | � Meiscill | Reviresco. | I flourish again. |
| May | � Miadaig | Fortis et fidelis. | Brave and faithful. |
| Meade | Miac | Toujours pret. | Always ready. |
| O'Meara | � Me�ra | Opmia spolia. | The richest of the spoil. |
| Meehan | � Miadac�in | Misni�il agus d�lis. | Brave and faithful. |
| Mc Millan | Mac Maol�in | Miseris succurrere disco. | I learn to succour the unfortunate. |
| Miller | | Sibimet merces industria. | Industry is a recompense to itself. |
| Milligan | � Maolleag�in | Regarde bien | Attend well. |
| Mill(s) | An Muilinn | Glandium musqrum nutrix. | The sword is the muse of muses. |
| Mitchell | Mist�il | Sola virtus nobiltat. | Virtue alone ennobles. |
| Moffatt | Moif�id | Spero meliora. | I hope for better things. |
| Molloy | � Maolmuaid | Gearaig agus dog buad. | Cut and burn to victory. |
| Moloney | � Maolomnaig | In Domino et non in arcu sperabo. | In God and not in my bow I will hope. |
| Monaghan | � Manac�in | Felis demulcta mitis. | The stroked cat is meek. |
| Montgomery | Mac Lomaire | Gardez bien. | Guard well. |
| Mooney | � Maonaig | Sola virtus nobiltat. | Virtue alone ennobles. |
| Moore | � M�ra | Conlan ab�. | Conlan forever. |
| Moore | � M�ra | Spec mea Deus. | I hope in God. |
| Moran | � Mor�in | Lucent in tenebris. | They shine in darkness. |
| Moriarty | � Muireartaig | Scandit sublima virtus. | Virtue scales great heights. |
| Morley | � Muraile | S'ils te mordent mords les. | If they bite thee, bite them. |
| Moroney | � Maolruanaid | Amicis semper fidelis. | Always faithful to my friends. |
| Morris | (�) Mac Muiris | Si Deus nobiscum qui contra nos. | If God be with us, who can be against us. |
| Morton | Mort�n | Virtutis praemium. | Virtues reward. |
| Mulcahy | � Maolcataig | Conlan ab�. | Conlan forever. |
| Muldoon | � Maold� in | Pro fide et patria. | For faith and fatherland. |
| Mulholland | � Maolcallan | Semper praecinctus. | Ever ready. |
| Mullally | � Maolalaid | Intaminatis fulget honoribus. | It shines with unstained honours. |
| Mullan | (�) Mac Maol�in | Vivere sat vincere. | To conquer is to live enough. |
| Mac Mullen | Mac Maol�in | Fortis atque fidelis. | Brave and faithful. |
| Mullins | � Maol�in | Ne cede malis. | Yield not to adversity. |
| Mulvey | � Maoilmicil | Pro aris et focis. | For our altars and our home. |
| Mulvihill | � Maoilmicil | Pro aris et focis. | For our altars and our home. |
| Murdock | Mac Muireataig | Omnia pro bono. | All things for the good. |
| Murphy | � Murc� | Fortis et hospitalis. | Brave and hospitable. |
| Murray | � Muir� | Ditat fide servata. | Tried fidelity enriches. |
| Mc Murrough | Mac Murcada | | |
| Murtagh | � Muireartaig | Scandit sublima virtus. | Virtue scales great heights. |
