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Home ›Register of Clans 2019
Clans who wish to apply to be included in the Register of Clans should register online here
Clans not included on the Register of Clans have not registered/renewed their membership for the current year. We await contact from these clans and individuals who are interested in organising a clan.
Clans are listed according to the most common English version of the surname followed by the original Irish version. Please note that individual Clan Societies may differ in the spelling variations they use in English and Irish and that where appropriate we have used the original prefix of O' and Mac but these are not always used with every variant of each Clan name or can sometimes be used differently e.g. Mc, Mac, Mag, M' etc.
- Burke – De Búrca
- Caomhánach Laighean
- Carty of Connaught – Ó Carthaigh Connacht
- Cassidy of Fermanagh – Ó Caiside Fhear Manach
- Connolly – Ó Conghaile
- Cully – Ó Colla
- Dineen – Ó Duinnín
- Dixon / Dickson – Mac Riocaird
- Fagan – Ó Faodhagáin
- FitzGerald of Co. Tipperary – Mac Gearailt Thiobraid Árann
- Hackett of Leinster – Ó hAicéad Laighean
- Haggerty of Ulster – Ó h-Éigeartaigh Uladh
- Hoban of Cenél Eoghain – Ó hÚbáin Cenél Eoghain
- Joyce of Joyce Country – Seoigh Duthaigh Seoghach
- Kelly Clan Association – Muintir Ui Cheallaigh
- Keohanes of West Cork – Ó Ceocháin
- Kilcrann of Leitrim – Mac Giolla Crann Liatroma
- Mac Cabe of Breffny – Mac Cába Breffny
- Mac Costello of Galway MacGoisdelbh Gaillimh
- Mac Curtin of Thomond – Mac Curtáin Thuamhumhan
- Mac Egan of Hy Many – Mac Aodhagáin Uí Maine
- Mac Garvey of Ulster – Mac Gairbhith Ulaidh
- Mac Geoghegan of Westmeath – Mag Eochagáin na hIarmhí
- Mac Gilpatrick of Ulster – Mac Giolla Phádraig Ulaidh
- Mac Ginley of Donegal – Mag Fhionnghaile Dhún na nGall
- Mac Grath of Thomond – Mac Graith Tuadhmhuman
- Mac Grath of Ulster – MacCraith na Uladh
- Mac Hale of Co. Mayo – Mac hÉil Condae Mhuigheo
- Mac Kenna of Truath – Mac Cionaoith
- Mac Kernan – Mac Tigearnain
- Mac Laughlin of Tirconnell – Mac Lochlainn Thír Chonaill
- Mac Mullen – Mac Maoláin
- Mac Shane – Mac Seáin
- Mannion of Soghan – Ó Mainnín Soghain
- Monaghan – Ó Manacháin
- Mulqueen of Ballymulqueeny – Ó Maolchaoin Baile-Ui-Maolchaoine
- Nolan – Ó Nualláin
- O'Boylan of Darty – Ó Baoighealláin
- O'Brien of Thomond – Ó Briain
- O'Brosnan of Brosna – Ó Brosnacháin Brosnach
- O'Byrne of Leinster – Ó Broin Laighean
- O'Carroll of Oriel – Ó Cearbhaill Oirialla
- O'Cleary of Co. Donegal – Clann Uí Chléirigh
- O'Crowley of Cork – Ó Cruadhlaoich Corcaigh
- O'Dea of Dysert – Ó Deághaidh Dísert
- O'Donnell of Tyrconnell – Ó Domhnaill Tír Chonaill
- O'Donoghue Society – Cuman Ó Donnchadha
- O'Donovan – Ó Donnabháin
- O'Dowd – Ó Dubhda Uí Fiachrach Muaidhe
- O'Driscoll of Corca Laoidhe – Ó hEidersceoil Corcu Loígde
- O'Dwyer Kilnamanagh – Ó Duibhir Coill na Manach
- O'Farrell of Annaly – Ó Fearghail Angaile
- O'Flanagan of Upperthird – Ó Flannagáin Uachtar Tíre
- O'Flanagan – Ó Flannagáin
- O'Gara of Coolavin – Ó Gadhra Cúil Ó bhFinn
- O'Higgins of Cenel Fiachach – Ó hUigin Cenél Fiachach
- O'Hosey of Fermanagh – Ó hEodhusa Fhear Manach
- O'Kearney of Derry – Ó Cearnaigh Doire
- O'Lafferty of Tyrone – Ó Laithbheartaigh Tír Eoghain
- O'Lalor of Leix – Ó Leathlobhair Laoise
- O Mahony Society – Muintir Mhathúna
- O'Malley Clan – Clann Ó Máille
- O'Mulpatrick of Breifne – Ó Maol Phádraig Breifne
- O'Mulvihill of Connacht – Ó Maoilmhichil Connachta
- O'Neill – Ó Neill
- O'Reilly Breifne – Bréifne Ó Raghallaigh
- O'Shaughnessy of Kiltartan – Ó Seachnasaigh Cill Tartan
- O'Sullivan of Munster – Ua Súileabháin Mhumhain
- O'Tierney – Ó Tighearnaigh
- Poole -
- Roche
- Shortt – Mac Girr/MacAnghearre
- Walker – Mac Siúbhlaigh
- Weadick MacMurrough – Mac Mhadóc mac Murchadha