The following is a list of Irish clans sourced from modern published sources.
Unlike Scottish clans which are defined by surnames recognised by Scottish law of the Court of the Lord Lyon, there is no definitive authority on which surnames are regarded as Irish clans. [1]
LangSyne Publishers, who are based in Kilbarrack, Dublin, Ireland, have published individual books on the following Irish clan surnames and their histories: Barry, Boyle, Brady, Brennan, Burke, Byrne, Callaghan, Carroll, Casey, Cassidy, Clancy, Collins, Connolly, Coyle, Daly, Devlin, Doherty, Donnelly, Donovan, Doran, Doyle, Duffy, Dunne, Farrell, Fitzgerald, Fitzpatrick, Flaherty, Flanagan, Flynn, Foley, Gallagher, Griffin, Healy, Higgins, Hogan, Joyce, Kane, Kavanagh, Kelly, Kennedy, Kenny, Lynch, Maguire, Malone, McCarthy, McCormick, McDermott, McGrath, McGuigan, McKenna, McLoughlin, McMahon, McManus, McNamara, Moore, Moran, Mullan, Murphy, Nolan, O'Brien, O'Dowd, O'Dwyer, O'Grady, O'Halloran, O'Hara, O'Keeffe, O'Leary, O'Neill, O'Rourke, O'Shea, O'Connor, Quinn, Reagan, Reilly, Rooney, Ryan, Sheehan, Sheridan, Sullivan, Sweeney, Traynor, Walsh, Ward, Whelan. [2]
John Grenham in his 1993 book, Clans and Families of Ireland: The Heritage and Heraldry of Irish Clans and Families, lists the following Irish clan surnames and gives at least a paragraph of information for each: Aherne, Allen, Armstrong, Barrett, Barry, Beatty, Bell, Boyd, Boyle, Bradley, Brady, Breen, Brennan, Browne, Buckley, Burke, Burns, Butler, Byrne, Cahill, Campbell, Carroll, Casey, Cassidy, Clancy, Clarke, Cleary, Coleman, Collins, Conlon, Connolly, Conway, Corcoran, Costello, Coughlan, Craig, Cronin, Crowley, Cullen, Cunningham, Curran, Daly, Delaney, Dempsey, Dillon, Doherty, Dolan, Donnelly, Doran, Dowd, Dowling, Doyle, Driscoll, Duffy, Duggan, Dunne, Dwyer, Egan, Fahy, Farrell, Ferguson, Finnegan, Fitzgerald, Fitzpatrick, Flaherty, Flanagan, Fleming, Flynn, Foley, Ford, Fox, Gallagher, Gorman, Graham, Greene, Griffin, Hall, Hamilton, Hayes, Healy, Hegarty, Hennessy, Henry, Hickey, Higgins, Hogan, Hughes, Hurley, Johnston, Jones, Joyce, Kane, Kavanagh, Keane, Kearney, Keating, Kelleher, Kelly, Kennedy, Kenny, Keogh, Kerr, Kiely, King, Leary, Lee, Lenehan, Lennon, Long, Lynch, Lyons, MacAuley, MacBride, MacCabe, McCann, MacCarthy, MacCormack, MacCullagh, MacDermot, MacDonagh, MacDonald, MacDonnell, MacEvoy, MacGillcuddy, MacGovern, MacGowan, MacGrath, MacGuiness, MacHugh, MacKenna, MacKean, MacLoughlin, MacMahon, MacManus, MacNally, MacNamara, Madden, MacGee, Maguire, Maher, Malone, Martin, Meehan, Molloy, Moloney, Monaghan, Mooney, Moore, Moran, Morgan, Moraiarty, Morris, Mullan, Mulligan, Murphy, Murray, Nolan, O'Brien, O'Callaghan, O'Connell, O'Connor, O'Donnell, O'Donoghue, O'Donovan, O'Grady, O'Hara, O'Keefe, O'Mahony, O'Neill, O'Rourke, O'Shea, O'Sullivan, O'Toole, Patterson, Power, Quigley, Quinn, Redmond, Regan, Reid, Reilly, Riordan, Robinson, Roche, Rogers, Rooney, Ryan, Scott, Sheehan, Sheridan, Smith, Stewart, Sweeney, Tobin, Wallace, Walsh, Whelan, White, Woods. [3]
The 6th edition includes over 4,000 Irish surnames