| Modern and Anglicised Forms | Old Irish Forms | Meanings |
| Madden | ||
| Madigan | ||
| Magauran | ||
| Magettigan | O'h-Eitegein | |
| Magilsinan | Magilsitnan | |
| Magnan | O'Maghnain | |
| Magoran, Orume, Orme | Mac Odhrain | |
| Magunshinan | ||
| Mahaffy | ||
| Mahaney | ||
| Maher, Mahar | ||
| Mahonen | ||
| Mahoney, O'Mahoney, O'Mahony, Mahonny, Mahorney | ||
| Maines | ||
| Makens | ||
| Malcan, (Singer) | O'Maoilcana | |
| Malia | ||
| Mallin, Mallon, Mallen | O'Mailina | |
| Malloy | ||
| Malone | O'Maoileoin | |
| Maloney, Malony, Malonny, Mullowne, Mullowney, Mullooney | O'Maoilbloghain | |
| Mandy | ||
| Mangan, Mongan, Mungen | O'Mongain | |
| Manley, Manly | ||
| Mannion, (Manning) | O'Mainnin | |
| Mannix, Manix | ||
| Markam, Horseman, Ryder | O'Marcachain | |
| Markey, Markley | ||
| Maroney | ||
| Marr | ||
| Marren | ||
| Maskey | ||
| Massey, Massie | ||
| Matchett | ||
| Mawhinney | ||
| May | ||
| Mayclin | ||
| Mayo | ||
| Meachar | ||
| Meade | ||
| Meagher | ||
| Meehan | O'h-Emeachain | |
| Meekin | ||
| Meenehan, Meenan? Minahan, Mynahan | O'Muimhneachain | |
| Megahey | ||
| Megarity | ||
| Meighan | ||
| Melaven | ||
| Mellan, Mellon, Mellen | O'Mellain | |
| Melloy, Meloy | ||
| Melody | ||
| Menagh | ||
| Menton | ||
| Mergin, Bergin, Bergan, Bergen | O'Aimirgin | |
| Mernagh | ||
| Meyler | ||
| Mhaolain | ||
| Miley | ||
| Millan | ||
| Millett | ||
| Milford | O'Mulfover | |
| Millia | ||
| Milligan | ||
| Millikin | ||
| Minikin, Minnick | ||
| Minto | ||
| Moghan, Mohan | O'Mochain | |
| Molan | ||
| Molina | O'Maoilfhiona | |
| Molloy | ||
| Molone, Moloney | ||
| Monaghan, Monahan, Monohan, Mongan | O'Muineog | |
| Monarty | ||
| Monteith | ||
| Moody | ||
| Moonen | ||
| Mooney, Meeny | O'Maoinaigh | |
| Moraghan, Morahan | ||
| Moran | O'Mughroin | |
| Morell | ||
| Morley | O'Murgally | |
| Moriarity, Moriarty, Moriaty | ||
| Moroney, Moroni | ||
| Morrin | O'Morain | |
| Morrissey, Morrisy | O'Muirgheasa | |
| Morrow | ||
| Motley, Mottley | ||
| Moyles, Moiles, Moles | ||
| Moynagh | O'Maonagh | |
| Moynihan | ||
| Mugan | ||
| Muintirceallaigh | ||
| Muintirlideadha | ||
| Mulally | ||
| Mulcahy | ||
| Muldoon, Muldown | O'Maoilduan | |
| Mulgrew, Mulgrue | ||
| Mulharen, Mulhearn, Mulheron | ||
| Mulholland, Mullholan, Mullholand | O'Maoilcallain | |
| Mulkeen | ||
| Mulkeerrinn | ||
| Mullally | ||
| Mullaney | ||
| Mullarkey | ||
| Mullattin, Molohan, Molohon | O'Maoilaithin | |
| Mulligan, Mullgan (Baldwin) | O'Mulligan | |
| Mullin, Mullins | ||
| Mulratty, Malet, Ratten, Rait | O'Maoilraite | |
| Mulrenan, Mulrennan | O'Maoilbhrenain, O'Maoilbhreanainn | Follower of St Brendan |
| Mulrooney, Moroni | O'Mulrony | |
| Mulroy, Roy | O'Maoilruaidh | |
| Mulroyne | O'Maoilruain | |
| Mulvaney, Mulvanney, Mulvany | ||
| Mulvey | ||
| Mulvihil, Mulvihill, Mulvehill | ||
| Mundell | ||
| Mungavan | ||
| Munley | ||
| Murdock | ||
| Murnaghan, Mynahan | ||
| Murphy, Morphie, O'Murphy, MacMorrow, MacMarray, MacMurray, MacMurrough, Morell | O'Murchadha, O'Murchada, MacMurchada | Murchadh sea-warrior |
| Murray | O'Muireadhaigh | |
| Murtagh, Murtaugh, Murty, Mortimer | ||
| Mylett | ||
| Myrick | ||
| Nagle | ||
| Nangle | ||
| Nash | ||
| Neal, Nealon, Neilan | ||
| Neary | ||
| Nee | ||
| Nelligan | ||
| Nesbit, Nesbitt | ||
| Nesdale | ||
| Nimmons | ||
| Nogan | ||
| Nohilly | ||
| Nolan, Noolan, Nolin, Nowlan | O Nuallain, O'h-Uallachain, MacUallachain, MacCuolahan, | Desc Of Nuallan |
| Noone, Noon, Noonan, Nuana | O'Nuadhain | |
| Norris | ||
| Nugent | MacGunshenan, Magunshinan | |
| Nunnally | ||
| O'Biernes | ||
| O'Boye | ||
| O'Brien, Brine | O'Briain | Desc of Briain (Brian Boru?) |
| O'Briun, Briun, Brin | O'Beirne | |
| O'Buhilly | ||
| O'Carroll, Carroll | ||
| O'Corráin | ||
| O'Cuinneagain | ||
| O'Cunig | ||
| O'Dea | ||
| O'Donall, O'Donell, O'Donnell, O'Donnell | O'Domhnaill | |
| O'Dowd, O'Dowda, Dowd, Dowdy, Doud | O'Dubhda | |
| O'Faelechoin | ||
| O'Falvey | ||
| O'Faolain | ||
| O'Flarety | ||
| Ogan | ||
| O'Gara | ||
| O'Grady, Grady | ||
| O'Hara, O'Harra | ||
| O'Hardy | ||
| O'Hayer, O'Hare, Hare | O'h-Ir, O'Hir | |
| O'Hehir, Hehir, O'Hea, O'Haire, O'Hare, Hare | O'h-Aichir | |
| O'Hilly | ||
| O'Hiskeen, O'Histeen, Hastings | O'h-Uisgin | |
| O'Hora, O'Hore | ||
| O'Horrigan | ||
| O'Howen, Owens | O'h-Eoghain | |
| O'Keefe, O'Keeffe, Keefe | ||
| O'Laodhog | ||
| O'Leary, Leary | ||
| O'Malley, Maley | ||
| O'Meara, O'Mara, Meara, Mara | O'Mearadhaig | |
| O'More | O'Mordha | |
| O'Mulloy, Mulloy | ||
| O'Neal, O'Neil, O'Neill, Neele, Neely | Desc of Neill | |
| O'Riordon, Riordan, Reardon, Readon | ||
| Orman, Orr | ||
| O'Rourke, O'Roark, Rourke, Roark, Rooke | O'Rourke | |
| O'Shea, Shay, Shea, Shaw | O'Seagha
O'Seghdha |
|
| O'Sullivan, Sullivan, Silver, Silvers | O'Suilleabhain, O'Suileabhain | Suil - 'eye' + Levan, a Celtic god |
| O'Toole | ||
| O'Trehy | ||
| Pace | ||
| Padden, Paden | ||
| Paibht | ||
| Palmer | O'Mulfaver | |
| Parkhill | ||
| Parle | ||
| Patton | ||
| Payne | ||
| Pender | ||
| Perry | ||
| Phelan | MacGiolla Fhalain | |
| Pierce, Peirce | ||
| Plannery | ||
| Plunkett | ||
| Power, Powers | ||
| Prendergast, Pendergast | ||
| Price? | O'Luachain | |
| Punty | ||
| Quaine, Quan | O'Cuain | |
| Qualey | ||
| Quealey | ||
| Quigg | ||
| Quigley | O'Coiglidh | |
| Quilligan | ||
| Quinan | ||
| Quinlan | ||
| Quinlivan | ||
| Quinn | MacCuinn, O'Cuinn | Desc of Conn |
| Rabbit, Rabbitt | ||
| Radden, Ravan, Radwin | O'Radubhain | |
| Rafferty | O'Rabhartaigh | |
| Rafter, Raftery | MacReachtagain | |
| Rainey | ||
| Rattigan, Ratigan, Rhatigan | ||
| Ratty | ||
| Rea | ||
| Regan, Reagan, O'Regan | O'Riagain | |
| Reavey | ||
| Redden, Reddin | ||
| Redican | ||
| Reed, Reid, Reedy, Ready, Reidy | ||
| Reen | ||
| Reilly, Riley, O'Reilly, O'Rielly, O'Reiley, O'Rahilly | O'Ragailligh | Desc of Ragaillach |
| Relihan | ||
| Renehan, Ranahan | ||
| Riddle | ||
| Rigney | ||
| Roach, Roache, Roche | ||
| Robey, Robie, Roby | ||
| Rock, Rocks | ||
| Roddy? (Rogers) | O'Ruadhraigh | |
| Roden, Grayden | Mag Rodain | |
| Rogan, Rohan | ||
| Rolan, Rollan, Rollin, Rowlan, Rowley, Rowland | O'Rothlain | |
| Ronan, Ronayne | O'Ronain | |
| Roody | ||
| Rooney | ||
| Rossiter | ||
| Rowells, Rowles | ||
| Royle | ||
| Ruane, Rowan, Roan | O'Ruidhain | |
| Rusa | ||
| Rushe | O'Luachair | |
| Ruther | ||
| Ryan, Murrian, Murrin | O'Mulrian, O'Malvilriain | |
| Sallery | ||
| Salmon, Salmons, Sammon, Sammons | ||
| Sangster | ||
| Sankey | ||
| Saul | ||
| Scannell, Scanlon, Scanlan, Seanlan | O'Scannail | |
| Scullin | ||
| Scully, Duscully, Scally? | O'Duibhscuile | |
| Sebon | ||
| Seeny, Fox | O'Sionna | |
| Seery | ||
| Semple | ||
| Sexton | O'Seisnain | |
| Sewell, Walker | O'Sewell | |
| Shade | O'Sedna | |
| Shahan | ||
| Shalloo | (Fr Challoux?) | |
| Shanahan | ||
| Shankland, Shanklin | ||
| Shanley | ||
| Shannon | ||
| Sharkey | ||
| Sharvan | ||
| Shaughnessy, Shoughness, Sandys, O'Shaughnessy | O'Seachnasaigh | |
| Sheedy | ||
| Sheehan, Sheahan, Shehan | ||
| Sheehy | ||
| Sheil | ||
| Shelley, Shelly, Schelly, Schely | ||
| Sheridan | ||
| Sherin | ||
| Sherlock | ||
| Sherman | ||
| Sherwin | ||
| Shevlan, Shevlin | ||
| Shields, Shiels | ||
| Shine | ||
| Shortall, Shortell | ||
| Shorten | ||
| Shovlin | ||
| Sieferman | ||
| Silven | ||
| Silvers | ||
| Sims, Simmes, Simpson, Simkins, Simcocks, Simon | MacSimoin | |
| Sinnott | ||
| Skahill, Cahill | ||
| Skelley, Skelly | ||
| Skerrett | ||
| Slattery | ||
| Slavin | ||
| Sloane | ||
| Smytherman | ||
| Snee | ||
| Sollers | ||
| Somers | O'Sumaghain | |
| Somerville, Sommerville | ||
| Speers | ||
| Spellacy | ||
| Spellman | ||
| Spillaan, Spillaine, Spillane, Splaine, MacSpallane, (Spenser) | O'Spealain, MacSpeallane | |
| Stack | ||
| Starkey | ||
| Staunton | ||
| Stoney | O'Mulclohy | |
| Strachan, Strahan | ||
| Straffan | ||
| Sugrue | ||
| Sunagh, Swanny | O'Suanaigh | |
| Suppel | ||
| Suthern | ||
| Sweeney | ||
| Synan | MacGila Sinin | |
| Taaffe, Taffe, Taft | ||
| Tackit | O'Tackney | |
| Taft | ||
| Taggart | ||
| Tallon | ||
| Tangney | ||
| Tansey | ||
| Tarpey, Tarpy, Torpy | O'Tarpaigh | |
| Teague, Tighe | O'Teagha | |
| Teeples | ||
| Teevans | ||
| Tegan | ||
| Tenehan | ||
| Tenpenny | O'Tiompain | |
| Tiernan, McTiernan | O'Tighearnain | |
| Tierney | O'Tighearnaigh | |
| Tiffany, Tiffney | ||
| Timmins, Timmons, Timon, Tymon | ||
| Toal | ||
| Tobin, Toban | ||
| Toffey, Todd | O'Toghdha | |
| Tolan, Toland, Thulis, Tollis | O'Tuathalain, O'Tuathlains | |
| Tolbert | ||
| Tomelty | ||
| Toner, Tonner | ||
| Toody | ||
| Toomey, Twomey | ||
| Tormey | ||
| Torpy | ||
| Trant | ||
| Trautt | ||
| Travers | ||
| Traynor | ||
| Treacy, Tracy, Tracey | ||
| Trench | ||
| Troy | O'Turrain | |
| Tully, Tilly, Tilley | O'Taichligha | |
| Tunney | ||
| Tuohy, Tuhe, Tuhey, Touhy, Towey | ||
| Turley | ||
| Turvey | ||
| Tweedy | ||
| Tynan | ||
| Unckles | ||
| Uriell | ||
| Vail | ||
| Vallila | ||
| Veale | ||
| Waddell | ||
| Wahlen | ||
| Waldron | ||
| Wall | ||
| Walsh, Welch, Welsch, Welsh | A Welshman | |
| Ward | Mac an Bhaird | Son of the bard |
| Warrington | ||
| Waterbury | ||
| Waters | ||
| Watt | ||
| Webb | ||
| Weeney | ||
| Weir | ||
| Whatley | ||
| Whelan | ||
| Wittlin | ||
| Wogan | ||
| Woods, Wood | O'Coilligh | |
| Woulfe, Wolfe | MacTyre
O'Faelechoin |
|
| Wylie | ||
| Wynn, Wynne, Mulgeehy | O'Maoilgaoithe | |
| Yeates |
This collection of names was compiled by Kate Monk and is ©1997, Kate Monk.
Copies may be made for personal use only.