Irish Families and their alternate spellings. Data from Edward MacLysaght's Irish Families book.

O'Aherne (Hearne, O'Heffron)

Athy,

MacAuliffe

MacAwley (Cauley, Magawley)

Barrett (MacPadine, MacEvilly, Staunton)

Barry

O'Beirne

Blake (Caddell, Blowick)

Bodkin

O'Boland (Bolan)

O'Boylan (Boyland)

O'Boyle

MacBrady

O'Brallaghan (Bradley)

O'Breen (MacBreen)

O'Brennan (MacBrennan)

MacBride (Kilbride)

O'Brien

Browne

O'Buhilly (Buckley)

Burke (Bourke, de Burgh)

Butler

O'Byrne

MacCabe

MacCafrey (MacCafferky)

O'Cahill

O'Callaghan (Kelaghan)

MacCann (Canny)

O'Cannon (MacCannon)

Carey (O'Keary, Carr)

O'Carolan (Carleton)

O'Carroll (MacCarroll, MacCarvill)

MacCartan (Carton)

MacCarthy

O'Casey (MacCasey)

O'Cassidy

MacClancy (Glanchy)

O'Clery (Clarke, MacClery, Clerkin)

O'Coffey (Cowhig)

MacCoghlan (O'Coughlan, Cohalan)

MacColgan

O'Colman (Coleman, Clifford)

O'Concannon

Condon

O'Connell (Gunning)

O'Connellan (Conlan, Conlon)

O'Connolly

O'Connor

O'Conry (Conroy, O'Mulconry, King)

MacConsidine

MacConway (O'Conway, Conboy, Convey)

O'Cooney

O'Corcoran (MacCorcoran)

MacCormack (O'Cormacan)

O'Corrigan (Carrigan)

MacCostello (Nangle)

MacCotter

MacCoy (MacCooey)

Coyne (Kilcoyne, Kyne, Coen)

Creagh

O'Crean (Crehan, Cregan)

O'Crowley

O'Cullane (Collins)

O'Cullen

O'Cullinan (Quillinane)

Cummins (Comyn, Commons)

O'Cunigan (MacCunigan, Cunningham, Dongan, Counihan)

MacCunneen (O'Cunneen, Kenyon, Kinnane)

MacCurley (Kerley, Turley, Terry)

O'Curran

O'Curry (Corry)

MacCurtin

Cusack

Dalton

O'Daly

Darcy (O'Dorcey, MacDarcy)

O'Dargan (Dorgan)

O'Davoren

O'Dea

O'Delany (Delane, Dillane)

O'Dempsey

MacDermot (Kermode)

O'Devine (Davin, Devane)

O'Devlin

Dillon

O'Dinneen (Downing)

O'Doherty (MacDevitt)

O'Dolan (Doolan)

MacDonlevy (Dunleavy, Leavy)

MacDonnell

O'Donnell

O'Donnellan (Donlon)

O'Donnelly

MacDonogh (Donaghy)

O'Donoghue (Donohoe, Dunphy)

O'Donovan

O'Dooley

O'Doran (Dorrian)

O'Dowd (Dowda, Doody, Duddy)

O'Dowling

O'Downey (MacEldowney)

Doyle (MacDowell)

O'Driscoll

O'Duffy (Duhig, Dowey)

O'Duggan (O'Dugan)

O'Dunn (Dunn)

O'Dwyer

MacEgan (Keegan)

MacElroy (MacGilroy, Kilroy)

MacEnchroe (Crowe)

MacEniry (Henry, O'Henry, Fitzhenry)

MacEvoy (MacElwee, MacGilloway, MacVeagh).

Fagan

O'Fahy

O'Fallon (Falloon)

O'Farrell (O'Ferrall)

O'Farrelly (Farley)

O'Feeney

O'Finn (Maginn)

O'Finnegan

FitzGerald (Barron)

FitzGibbon (Gibbons)

Fitzpatrick (Kilpatrick)

O'Flaherty (Laverty)

O'Flanagan

O'Flannery

Fleming

O'Flynn (O'Lynn)

O'Fogarty

O'Foley (MacSharry)

Forde (MacKinnawe, Foran)

Fox

French (de Freyne)

O'Friel.

Gaffney (Caufield, O'Growney, Keveney, MacCarron)

O'Gallagher

O'Galvin

MacGannon

O'Gara (Geary)

MacGarry (Garrihy, O'Hehir, Hare)

O'Garvey (MacGarvey, Garvin)

MacGee

MacGenis (Guinness, Magennis)

MacGeoghegan

MacGeraghty (Gerty)

MacGilfoyle (Powell)

MacGillycuddy (Archdeacon, Cody)

O'Glissane (Gleeson)

MacGorman (O'Gorman)

O'Gormley (Grehan Grimes)

MacGovern (Magauran)

MacGowan (O'Gowan, Smith, MacGuane)

O'Grady

MacGrath

O'Griffy (Griffin, Griffith)

MacGuire (Maguire).

Hackett

O'Hagan (Aiken)

MacHale

O'Halloran

O'Hanlon

O'Hanly

O'Hannon (Hanneen)

O'Hanrahan (Hourihane)

O'Hanraghty (Enright, Hanvey)

O'Hara

Harrington (O'Harraughton)

O'Hart

O'Hartigan

O'Hea (Hayes, Hughes)

O'Healy (Hely, Kerrisk)

O'Heffernan

O'Hegarty

O'Hennessy (Henchy)

O'Heyne (Hynes)

O'Hickey

O'Higgin

O'Hogan

O'Holohan (Holland, Mulholland, Hyland)

O'Horan (Haren)

O'Hosey (Hussey)

O'Houneen (MacGlashan, Greene)

MacHugh

O'Hurley (O'Murhila, Murrily, O'Herlihy).

MacInerney (Nerney, Kinnerk).

Jennings

Jordan

Joyce.

Kavanagh (Keevan)

Keane (O'Kane, O'Cahan, MacCloskey, MacEvinney)

O'Kearney (Carney)

Keating (Keaty)

O'Keeffe

O'Keenan

O'Kelleher

O'Kelly (Queally, O'Keily)

MacKenna

O'Kennedy (Minnagh)

O'Kenny

MacKeogh (Kehoe, O'Hoey, Hoy)

MacKeon (MacKeown, Owens, Hone)

O'Kieran (O'Kerin, Kearns, Kerrane)

O'Kinneally (Quinnelly)

Kinsella

O'Kirwan.

Lacy (de Lacy)

Lally (O'Mulally)

O'Lalor (Lawlor)

O'Leary

O'Lee (MacAlee)

O'Lenaghan (Linehan)

O'Lennon (Linnane, Leonard, Linnegar, MacAlinion)

O'Lonergan

O'Lorcan (Larkin)

O'Loughlin (Loughnane)

MacLoughlin

O'Lowry (Lavery)

Lynch

O'Lyne (Lyons, Lehane, Lane)

MacLysaght (MacAleese).

O'Madden (MacAvaddy, Madigan)

MacMahon (Mohan, Vaughan)

O'Mahony

O'Malley

O'Malone

Mangan (O'Mongan)

Mannion (O'Mannin, Manning)

Mannix (O'Mannis, O'Manihan, MacNeice)

MacManus

Martin (Gilmartin)

O'Meagher (Maher)

O'Meara (O'Mara)

O'Meehan (Meighan)

O'Molloy (Miley)

O'Molony (Maloughney)

O'Monahan (Monks)

O'Mooney (Meeny, Mainey)

O'Moran

O'More (Moore)

O'Moriarty (Murtagh)

O'Moroney (Mulrooney)

Morris (Fitzmaurice, Morrison)

Morrissey

O'Mulcahy (Muckley)

O'Mullan (O'Mellan, Mullen)

O'Mulligan

O'Mulvihil (Melville, Mitchell)

O'Murphy (O'Morchoe)

MacMurrough

O'Murry (MacMurry, Murray, MacMorrow, Gilmore).

O'Naghten (MacNaughton)

Nagle (Nangle)

MacNally (MacAnally)

MacNamara

O'Neilan (Neylan)

O'Neill (Nihill)

O'Nolan

Nugent (Gilsenan)

MacNulty

O'Nunan (Noonan).

O'Phelan (Whelan)

Plunkett

Power

Prendergast (Pender)

Purcell.

MacQuaid

O'Quigley (Cogley)

MacQuillan

MacQuilly (Cox)

O'Quinlan (Quinlevan, Kindellan)

O'Quinn.

O'Rafferty (Roarty, Raftery)

MacRannall (Reynolds, Grannell)

Redmond

O'Regan

O'Reilly (O'Rahilly)

Rice (O'Mulcreevy)

O'Riordan (Rearden)

Roche (Rochfort)

O'Rooney

MacRory (Rogers, MacCrory)

O'Rourke

Ryan (O'Mulrian).

Sarsfield

O'Scanlan (O'Scannell)

O'Scully

O'Shannon (O'Shanahan, Gilshenan, Giltenan)

MacShanly

O'Shaughnessy

O'Shea (Shee)

O'Sheehan (Sheahan)

MacSheehy

O'Sheridan

O'Shiel (Shields)

Skerrett

O'Sullivan

MacSweeney.

Taaffe

MacTiernan (MacKiernan)

O'Tierney (Tiernan)

Tobin

O'Toole (Toal)

O'Tracy

Traynor

O'Trehy (Troy)

Tully (MacAtilla, Flood)

O'Twomey.

Wall

Walsh (Brannagh)

MacWard (Ward)

Woulfe

Barry Genealogy / Barry Coat of Arms
O'Shaughnessy Coat of Arms / Family History
MacShanly Coat of Arms / Shanly Family History
O'Shannon Coat of Arms / Shanahan Family History
Scanlan Coat of ARms / O'Scannell Family History
Ryan Coat of Arms / O'Mulrian / Irish Family History
O'Rourke Coat of Arms / O'Rourke Family History
MacRory Coat of Arms / Rogers / MacCrory Family History
O'Rooney Coat of Arms / Rooney Family History