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Corcu Loígde DNA Project

Pre-Eóganachta Rulers of Munster, Ireland
  • 207 members

About us

08 Aug 2019: Minor updates

Read the FAQ page for project prerequisites BEFORE CLICKING JOIN.


Corca Laidhe was a first millennium kingdom in the southern part of Ireland (Munster). Some scholars give an approximate date of 200 C.E. as an estimate of Corca Laidhe's presence in Munster. The acknowledged rulers were the O'Driscolls.

Corca Laidhe had a close affinity with Ossory, another old Irish kingdom that covered most of County Kilkenny and part of County Laois. Ossory was the origin of St. Kieran's father. The diocese of the same name, roughly coterminous geographically with the region, was founded with St. Kieran's mission, though its boundaries were not formally set down until much later. The Corca Laidhe, which had control of Munster, briefly had control of Ossory around the time of St. Kieran.

As a related line of research, the project administrators have an interest in identifying Corca Laidhe surnames that also appear in historical records of Kilkenny.

Encroachment of the O'Mahonys and various Eoghanacht septs by mid-to-late first millennium, the arrival of the Anglo-Normans around 1150 C.E., and conflict with England all contributed to the demise of the Corca Laidhe and eventually confined the descendants of the inhabitants and former rulers into a territory coinciding with part of the Roman Catholic Diocese of Ross - roughly Skibbereen to Clonakilty. This part (see illustration below) was split from the Beara part of the diocese, the latter now part of the Diocese of Kerry. The reconfiguration of Ross was likely due to the aforementioned pressures.

The O'Driscolls lost their ruler status and became McCarthy vassals. 19th century scholars attempted to track down the chieftain line. They interviewed some of the local people in west Cork, but were unable to conclusively trace any possible surviving direct male line descendants of Finghin O'Driscoll (17th century). There is no known surviving blood chieftain line, though possible cadet branches are still being investigated.

There is documentation of the names of the hereditary proprietors (chieftains) of Corca Laidhe, relatives, and their subjects from the 12th century. Corca Laidhe Pedigree (below) describes some of the texts used to reconstruct the family histories.

Scroll down for the following sections:

  • Corca Laidhe Territory
  • Corca Laidhe Pedigree
  • Project Forums
  • Surname Inclusion Notes

Corca Laidhe Territory

The Corca Laidhe people ended up somewhat confined to the boundaries of the old Catholic Diocese of Ross, comprised of parts of the present day districts of Skull, Skibbereen, and Clonakilty in West Cork. The illustration shows the portion of the diocese along the Skibbereen to Clonakilty coastline. Relevant R.C. Parishes include Aughadown, Rath & Islands, Skibbereen, Castlehaven & Myross, Kilmacabea & Kilfaughnabeg, Rosscarbery & Lissavaird, Kilmeen & Castleventry, Clonakilty & Darrara, Ardfield & Rathbarry, Timoleague & Clogagh, and Barryroe (Lislee, Abbeymahon, Donoughmore).

Corca Laidhe Pedigree

Old historical texts covering the Corca Laidhe people are not always self consistent and/or complete. The material has proven to be difficult to organize into a diagram and it is easy to get confused with so many names being the same from one generation to another or the same name being spelled slightly different. The diagram shows via gray lines some alternate pedigrees that can be picked out of the documents. Nevertheless, no matter the interpretation the general conclusion is the same, i.e. there once was and maybe now are persons named Driscoll, Coffey, Flynn, Leary, Barry and Clancy who share a common ancestor circa 200 AD.

Many families of the Corca Laidhe are referred to as hereditary proprietors. According to Webster's dictionary a proprietor is a person who has the legal right or exclusive title to something. In the present context that something would be land and the attendant income. A hereditary proprietor could originate as a cadet line (2d son, 3rd son, etc.), a son-in-law or reward for loyalty or service rendered. In some cases the listing of proprietors may simply be a record of land owners. There is good reason to expect the Corca Laidhe genealogy to involve multiple haplogroups and clades.

The genealogy of the Corca Laidhe is described by John O'Donovan in his treatise published in 1849 by the Celtic Society in the book Miscellany of the Celtic Society. He described his treatise as "various readings" from the Book of Ballymote as compared with the Book of Lecan, two books complied about 1400 from various other manuscripts. In addition a transcribed copy of the book is available thanks to a project at the University College Cork know as CELT, the Corpus of Electronic Texts. Another important source is the Book of Glendalough, otherwise known as Genealogies from Rawlinson B 502, which dates from 1130; therein one finds the Genelach Sil Lugdach Meic Itha. An O'Leary pedigree can be found in The O'Clery Book of Genealogies written in the 1600s. These books are all online, click the titles.

One purpose of this project is to build a database for names found in O'Donovan's treatise on the Corca Laidhe. Another is to critically examine the genealogy in light of the resultant data. Lastly, the data is made available to other investigators and family historians for analysis as may suit their purpose.

An additional piece of documentation has been added to our resources: Corcu Loígde: Land and Families, a paper by Dr. Donnchadh Ó Corráin of UCC.

Project Forums

Project members are encouraged to use the Activity Feed to ask questions about and discuss Corca Laidhe genealogy, history and DNA. Please be aware the admins may not know you have posted. Feel free to help one another to assist the volunteer admins.

Additionally there is a Rootsweb mailing list that is open to anyone, whether or not they are in the project. Most project participants have not signed up to it, so a post on the Activity Feed will potentially reach more viewers and responders. Rootsweb support has been unreliable over the past several years. Old archives are uploaded.

Surname Inclusion Notes

This table tracks names that have been added to the project and their source. The column labeled Pedigree includes fragments that appear relevant.

  • Miscellany of the Celtic Society (Misc)
    • 0. History of the Race of Lughaidh, Son of Ith. (p 3)
    • 1. Genealogy of Corca Laidhe here first (p 9) [University College Cork digitized]
    • 2. The Hereditary Proprietors of Corca-Laidhe (p 49)
    • 3. The Mearing of the middle Cantred of Ó Cobhthaigh's Territory (p 11)
    • 4. Of the genealogy of the Race of Aenghus Bulga (p 25)
    • 5. Of the Race of Aenghus, Son of Maicniadh, Son of Lughaidh, Son of Maicniadh (p 11)

  • Irish Ancestors (IA)
    • Variants - a surname search at the Irish Ancestors site returns info on where a particular variant will be found and a synopsis from the book by Seán de Bhulbh, Sloinnte na hÉireann-Irish Surnames, Comharchumann Íde Naofa, 1997. An acceptable variant is difficult to define. Herein if a variant is acceptable if there is precedent for that name having evolved from the root name and the name is associated with county Cork (or at least numerous and not uniquely connected to some other locale).

  • What's In A Name by Nora Hickey 
  • Agnomen - often in a locality there would be so many persons of a given surname that a secondary name was added to distinguish one family from another and it evolved to a primary name.
  • MacLysaght, The Surnames of Ireland, Irish Academic Press, 1985

  • O'Hart, Irish Pedigrees (1892), p. 281
    • The MacNicaill are said to branch off the Coffey 32 generations subsequent to Lughaidh Maccon leading to the modern names of MacNichol, MacNicol, Nicholls, Nicholas, MacNicholas, Nicholson, Nicolson, Nicols, Nicson, and Nixon. As of 27 Mar 2016, those in the Nichols DNA project who trace to Ireland are overwhelmingly from the north and probably not Corca Laidhe.

The following surname data is not alphabetized, but presented in the same sequence as that published in Miscellany of the Celtic Society. See the sections of the Miscellany, 0 - 5, above. In 2 is a breakdown by Tuath.

Use Control-F or the search function on your computer to locate your surname.

New surnames added to our project surnames in 2018 and afterwards are shown with a pale blue background

Chieftains of tuaths or lands are shown in slightly larger font.

Tuath and land divisions are shown with a light gray background.

New in August 2019: See the Results page for a continually updated tabulation of the Corca Laidhe surnames of fully participating members against known SNPs.

Older Modern Variants,
Notes Misc Pgs
0. History of the Race of Lughaidh, Son of Ith
0 Ua Baire O'Baire, Baire Barry See also Patrick Woulfe, 1923 43
1. Genealogy of the Corca Laidhe
1 Ua Cobhthaigh Coffey, O'Coffey, O'Cowhig Coffee   59
1 Ua Conchobhair O'Connor, Connor Connors   43
1 Ua Eidersceoil Driscoll, O'Driscoll Driskell, Driskill
Bohane, Cadogan, Cronican, Hooly, Kerukan, Kerwakan*, Minehane/Minihan, Whooly
[all Ref: Hickey] and Fahy, Fahey [Ref: JCHAS see right]
* Project member Irwin/Ó Ciarṁacáin notes: "The "ṁ” over my surname with the dot type accent on top is pronounced like a "W." Therefore my Ó Ciarṁacáin surname (without the "O") would be "Kerwakan." Not sure what this means but I just thought I would mention it."

Possible Clan Fahy branch from Castlehaven. [Ref. JCHAS 'Castlehaven and Its Neighborhood' and JCHAS 'Carbery Topographical Notes']
1 Ua Floinn-Arda Flynn, O'Flynn   See also JCHAS 1905 43
2. Hereditary Proprietors of the Corca Laidhe
Country of Gillamichael 50
2 O'Duibharda Doorty Dougherty, Doherty Country of Gillamichael 50
2 O'Dunlaing Dowling, Doolin Doolan, Doolen Dunlaing, Flann Arda
Country of Gillamichael
Drinagh TAB lists Driscoll Doolen of Curraghnaloughra


2 O'h-Ogain Hogan   Not the same name as Horgan [project]. 50
2 O'Dubhagain Duggan, Doogan   From Eochaidh Liathain are sprung Ua n-Aigheanain, Ua Tigheamaigh, Ua Ainnle, and Ua Dubhagain



2 Ua Meiceidich Keady, MacKeady Cady   50
2 Ua Ciabhain Keevan Kevan, Kevane, Kevin   50
2 Ua Ceartaigh O'Ceartig, O'Carty Carty Misc says it is obsolete but Ó Corráin proposes it has merged with McCarthy. 50
2 Ua Buadhaigh Buaig Bogue, Bohan, Bohane, Bohen, Bowe, Bowes One of the agnomina for Sullivan, an Eoghanacht family. 50
2 Ua Mongain Mangan, Mongan Manning Evidence in Drimoleague & Drinagh R.C. records, Drinagh TAB and Griffiths taken together suggests Mangan is an agnomen for Brien. 50
2 Ua Doirc Durk, Dark     50
2 Ua Meccon Maccon Macken   50
2 Ua Aingle Ceangail   Cuaingle, son of Lughaidh
2 Ua Mothla Mohilly, O'Mothola Ó Mothalaigh, Mahilly, Mohally, Moakley   50
2 Ua Maeileadair Ó Mael Étair Leader Ó Corráin suggests the contemporary form is Leader. 50
2 Ua Maeileadair O'Moilpeadair Mulpeter, Mulpetre Misc refers to O'Moilpeadair (Mulpeter) and says it is obsolete, but the modern variants are in the 1901 Ireland census. Ó Corráin believes the Mulpeter interpretation is erroneous. 50
2 Ua Adhaimh McAdam     50
2 Ua Bairr Barr     50
2 Ua Rosna Rosney Rossney Misc says it is obsolete but Rosney and Rossney are in the 1901 census. 51
Tuath Ui Chonneid 52
2 O'Conneid Kennedy, O'Kennedy Kennedy, McKennedy,
Driscoll Caedh, Driscoll McKennedy*
Connad son of Cillen, Ua Cobhthaigh
* Southern Star Dec 6, 1947 columnist Peadar O'Hanrahan said he assumed Caedh was a "worn down form of MacAodn."
2 O'Conneid Kenney Kenney Connad son of Cillen, Ua Cobhthaigh
Ó Corráin has a different interpretation and proposes Kenney.
2 O'Muimhnich Moyny, O'Muimhnig, O'Moynie, O'Moynig Meaney, Meany   51
2 O'Drochruainnigh     obsolete 51
2 O'Fuailchin   O'Tuailchin obsolete 51
2 Ua Chaingne O'Caingni Cagney   51
2 O'Dubhchonna Doheny   Dubhchonna, son of Flann Fuirtre
Tuath Indolaich 52
2 O'Laeghaire O'Leary Leary Macduithe (Duite), son of Eochaidh Badhamhna
from Eochaidh (son of Maicniadh) is sprung
Ua Badamhna
see also Nunc Ui Badamna, p. 259 in the Genealogies from Rawlinson B 502
2 O'Ruaidhrí O'Ruairc Rodgers, Rogers, Rory Some Sullivans may have used Rogers. 52
2 O'Lonain Lannin, Lenane Lennon Duach, son of Eirc, had four sons, namely, Fintan, Lonan, Ros, Follach 47

2 O'Torpa Torpy Torpey   52
2 O'Laidigh Liddy, Laddy   Laidhginn

2 O'h-Urmoltaigh Hamilton, Tromulty Hamilton Have not uncovered any evidence that the form Tromulty has survived.
There were Hamilton plantation settlers in west Cork; the names could have merged.
2 O'Mirin Mirreen     52
2 O'Macdairic     obsolete
2 O'Tuaraidhe     obsolete 52
2 O'Treana     obsolete 52
2 O'h-Uainidhe Green, Hooney Owney   52
2 O'Cerdin Kerdin, Curdin   Could this be an old form of Curtin, which is well-attested in Cork? 52
Tuath o'hAenghusa 52
2 O'h-Aenghusa Hennessy   Duach, son of Maicniadh 45
2 O'Corrbuidhe Corby     53
2 Ua Dubhain Duane, Dwan, Downes Kidney Dubhduin son of Flanna
[Patrick Woulfe] Kidney is an anglicization.
2 Ua Duinin Dinneen, Downing Dineen   53
2 O'Mudain Modan     53
2 O'h-Aidhne Hyney Hiney, Hynie Eochaidh Aidhnigh, son of Eichin
Fothadh Canann
2 O'Mainchin Mannin Manahan, Mannix Ailill Corran, from whom Maenach, from whom the Ui-Mainchine
2 O'Cuis, O'Coise Hussey, Cass Cas, Cass, Cos, Cash, Cosh, Cush, Quish [Not Cushin; project] The project proposes the additions. Cos has a notable presence in 19th century Kilkenny records. 53
2 O'Cuile Cooley     53
2 O'Dearcain Derkan O'Deargain - Dorgan   53
2 O'hIairsnigh     obsolete 53
2 O'h Odhrain Horan Houran, Houren, Howran, Howren   53
2 O'Grese     obsolete 53
2 O'Cuilin Cullen O'Coileain - Collins
[Ref: MacLysaght]
O'Cuilin likely absorbed into O'Coileain (Collins).
Some Cullinan, Callinan, Cullinane, Quillinan (below) who were or became Protestant go by Collins. [Janet Crawford]
2 O'Sinnaigh Fox, Shinny Shinnick   53
Tuath O'Fithcheallaigh 53
2 O'Fithcheallaigh Field, Feehily, Feely Fehilly, Fehily, Fihilly, Fihily, Fyhilly   53
2 O'Cormaic Cormick  

Ere had three sons - Cormac, Blarus, Fearghus

2 O'Comhraidhe Curry, Cowry, Corry, Cory   Misc states MacFirbisigh's materials give this alternative. 54
2 O'Donnamhain
Donovan, O'Donovan   A different family from O’Donnabhain of Ui-Cairbre Aebhdha in the now County of Limerick 54
2 O'Dubhchon     obsolete 54
2 O'h-Iarnain MacIarran Hernon, Hiernan BALLYEELINAN (Baile Uí Iarnáin) “O’Hiarnan’s Homestead.” From "Placenames of the Decies" by Rev. Canon Power. 54
2 O'Nuallain Nolan, Nowlan Noland   54
2 O'Croinin Cronin     54
2 O'Sife     Unknown 54
2 O'h-Ainbhith Hanvey, Hanafey Hanvy, Hannify   54
Tuath O'nDunghalaigh 53
2 O'Donnghaile Donnelly   Donnghal, p. 32, 33, 56, 57, 384, 9, n., 44, 45
Ua Eidersceoil

A.D. 901. Mudan, son of Donnghal lord of Corca-Laidhe, died Annals of the Four Masters.
9 n.,
2 O'Maolchomadh Molumby Molomby, Molumphy, Mulumby, Mulumphy [Patrick Woulfe] The project proposes these additions. Misc says obsolete but modern variants exist in 1901 Ireland census. 55
2 Ua h-Aedha Hayes, O'Hea     55
2 O'Loingsigh Lynch, Lynchy, Lingshy     55
2 O'Mailteimhin     obsolete 55
2 O'Ceallaigh Kelly O'Kelly Maicniadh had four sons, namely, Duach, Eochaidh, Aenghus, and Ceallach, from whom the Corca-Laidhe, p.45 ... See also this thread at the Corca Laidhe DNA Rootsweb list. 55
2 O'Muireadhaigh Murrihy Murray, Murrihy   55
2 O'Mailguirm     Misc says obsolete but Mulguren exists in 1901 Ireland census. 55
2 O'Sealbhaigh Shelly, Shallow Shealy, Sheily, Shiely (not Sealy)   55
2 O'Gabhadhain
Gavin Gabhran, son of Baire
Fothadh Canann
3. The Mearing of the Middle Cantred of Ó Cobhthaigh's Territory
Tuath Ui Duibhdaleithe 55
3 O'Dubhdaleithe Dowdall Dowdall, Dudley Dubhdalethe, son of Dubhleanna
Flann Arda
3 O'Mailceallaich Mulkelly   obsolete 55
3 O'Duibhleanna     obsolete 55
3 O'Mailchorna     obsolete 55
3 O'Cuileannain Cullennan Cullinan, Callinan, Cullinane, Quillinan Cuileannan, son of Bruadar
Flann Arda
Sometimes Collins in families that were or became Protestant. Occasionally Quinlan in Tipperary if not also Cork. [Janet Crawford]
3 O'Bruadair Broderick, Broder Brothers
[Ref: MacLysaght]
Flann Arda
Bruadar, son of Dunlaing, lord of Corca Laidhe, died 860, Annals
3 Ua Dunadhaich Downey, Denny   Dunadhach son of Flaithimh
Flann Arda
3 O'Lathimh Leahy, Lahiff, Lahy Flaithimh now Flahive Flann Arda 43
4. Of the genealogy of the Race of Aenghus Bulga
4 Meg-Fhlannchaidh Clancy, Mac Clancy Glancy Appendix B
Lughaidh Cal
see also Historical Notes on the Ancient Sept of Clancy/Glancy by Maria Clancy (under Book)
4 O'Credain Credan   Tealach-Critain
Lughaidh Cal
4 Ui Finn Finn Fynn Finn son of Maccon, p. 11, p.57
See also Ciarmhaie son of Finn, O'Ciarmhachain, Clann-Ciarmhaie below
Ua Eidersceoil
4 Gaibhtheachain Gaughan   race of Aenghus, son of Amhalghaidh
Lughaidh Cal
4 O'Uaruisce Hourisky   Tealach-Uaruisce
Lughaidh Cal
4 Tealach-Churnain O'Curnains, O'Curnins   Tealach-Curnain
Lughaidh Cal
4 Ua Finain O'Finan  

Finan son of Colman
Duach: Ui Aenghusa

Fina son of Fiachra



4 Ui-Floinn O'Flynn   Ui-Floinn, who are also of the race of Aenghus, son of Amhalghaidh
Lughaidh Cal
4 Ua Cuinn Quin      
4 O'Rothlain Rowley   Rothlan, son of Mairtine
Lughaidh Mac Ith
4 O'Treabhair Trevor Travers  
5. Race of Aenghus, Son of Maicniadh, Son of Lughaidh, Son of Maicniadhy
5 Ciarmhaie,
Irwin Kirby, Kerwick [Kirwan?] Ciarmhac son of Finn
Race of Cathra/Cathua son of Eiderscel were Clann-Finn of Garrdha, p. 11 [see above]
Ua Eidersceoil

Note from member Irwin: "Kirby (O Ciarmaic), Kerwick (O Ciarmaic) and Irwin (O Ciarmacain) derive their surname from the same source and trace their name origin to Knockainy, Limerick and as such monopolized the chieftaincy of Eoghanacht Ainy for centuries. I have no idea of who the known modern-day descendants of Clann-Ciarmhaic are and nor do I know their present-day surnames... According to ... (Big Y) I am closely related to both Driscolls and Finns."
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