Corca Laidhe

  • 141 members

About us

NB: We are currently revising our subgroups to better assist participants with more advanced SNP testing. Please be patient while the format is in a state of flux. All groups will be split into "confirmed" and "projected" with recommended next steps noted.


The Corca Laidhe were a medieval clan in the south west of Ireland.  The documents regarding the clan 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.

Membership Requirements - A yDNA test

  • An appropriate surname
  • A minimum of 37 markers tested
  • Most distant paternal ancestor specified

Project Forums

A Rootsweb mail list serves to support this project, click the respective links. Here members may interact with one another via discussion of topics such as the genealogy and history of the Corca Laihdhe or interpretation of the DNA results.

Surname List

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
    • 0. History of the Race of Lughaidh, Son of Ith.
    • 1. Genealogy of Corca Laidhe here first
    • 2. The Hereditary Proprietors of Corca-Laidhe
    • 3. The Mearings of the Middle Cantred
    • 4. Of the genealogy of the Race of Aenghus Bulga
  • Irish Ancestors
    • 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.
Source Then Now Variants, Agnomina Pedigree
(page in Miscellany)
0 Ua Baire O'Baire, Baire Barry p. 43
1 Ua Cobhthaigh Coffey, O'Coffey, O'Cowhig Coffee p. 59
1 Ua Conchobhair O'Connor, Connor Connors p. 43
1 Ua Eidersceoil Driscoll, O'Driscoll Driskell, Driskill
Bohane, Cadogan, Cronican, Hooly, Kerukan, Minehane, Whooly
[Ref: Hickey]
p. 57
1 Ua Floinn-Arda Flynn, O'Flynn   p. 43
see JCHAS 1905
2 Ua Bairr Barr    
2 Ua Buadhaigh Buaig Bohan, Bohane, Bohen, Bowe, Bowes  
2 O'Bruadair Broderick, Broder Brothers
[Ref: MacLysaght]
Flann Arda, p 43
Bruadar, son of Dunlaing, lord of Corca Laidhe, died 860, Annals
2 Ua Aingle Ceangail   Cuaingle, son of Lughaidh, p 41
2 O'Cuile Cooley    
2 O'Corrbuidhe Corby  .  
2 O'Cormaic Cormick   Ere had three sons, namely, Cormac, Blarus, Fearghus, p.39
see also p.19, 61, 65, 80
2 O'Croinin Cronin    
2 O'Cuilin Cullen O'Coileain - Collins
[Ref: MacLysaght]
2 O'Comhraidhe Curry, Cowry, Corry, Cory    
2 O'Dearcain Derkan O'Deargain - Dorgan  
2 Ua Duinin Dinneen, Downing Dineen  
2 O'Dubhchonna Doheny   Dubhchonna, son of Flann Fuirtre p.41
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.
2 O'Donnamhain
Donovan, O'Donovan   a different family from O’Donnabhain of Ui-Cairbre Aebhdha in the now County of Limerick, p. 54
2 O'Duibharda Doorty    
2 O'Dunlaing Dowling, Doolin Doolan Dunlaing, Flann Arda, p 43
2 Ua Dubhain Duane, Dwan, Downes   Dubhduin son of Flanna, p.17
2 O'Dubhagain Duggan, Doogan   From Eochaidh Liathain are sprung Ua n-Aigheanain, Ua Tigheamaigh, Ua Ainnle, and Ua Dubhagain, p.45
2 Ua Doirc Durk, Dark    
2 O'Fithcheallaigh Field, Feehily, Feely    
2 O'Sinnaigh Fox, Shinny    
2 O'Gabhadhain
Gavin Gabhran, son of Baire, p.45
Fothadh Canann
2 O'h-Uainidhe Green, Hooney    
2 O'h-Urmoltaigh Hamilton, Tromulty    
2 O'h-Ainbhith Hanvey, Hanafey    
2 Ua h-Aedha Hayes, O'Hea    
2 O'h-Aenghusa Hennessy   Duach, son of Maicniadh, p.45
2 O'h-Ogain Hogan    
2 O'h Odhrain Horan    
2 O'Cuis Hussey, Cass    
2 O'h-Aidhne Hyney   Eochaidh Aidhnigh, son of Eichin, p.43
Fothadh Canann
2 Ua Meiceidich Keady, MacKeady    
2 Ua Ciabhain Keevan    
2 O'Ceallaigh Kelly O'Kelly Maicniadh had four sons, namely, Duach, Eochaidh, Aenghus, and Ceallach, from whom the Corca-Laidhe, p.45
2 O'Conneid Kennedy, O'Kennedy   Connad son of Cillen,Ua Cobhthaigh, p.59
2 O'Cerdin Kerdin, Curdin    
2 O'Lonain Lannin, Lenane Lennon Duach, son of Eirc, had four sons, namely, Fintan, Lonan, Ros, Follach, p.47
2 O'Laeghaire Leary   Macduithe (Duite), son of Eochaidh Badhamhna, p.37
from Eochaidh (son of Maicniadh) is sprung
Ua Badamhna, p.45
see also Nunc Ui Badamna, p. 259 in the Genealogies from Rawlinson B 502
2 O'Laidigh Liddy, Laddy   Laidhginn, p.36, 37, 38, 39
Laighinn p. 33, 37
2 O'Loingsigh Lynch, Lynchy, Lingshy    
2 O'h-Iarnain MacIarran Hernon  
2 Ua Meccon Macken   Maccon
2 Ua Mongain Mangan, Mongan    
2 O'Mainchin Mannin Manahan, Mannix Ailill Corran, from whom Maenach, from whom the Ui-Mainchine, p.37
2 O'Mirin Mirreen    
2 O'Mudain Modan    
2 Ua Mothla Mohilly, O'Mothola Ó Mothalaigh, Mohally, Moakley  
2 O'Muimhnich Moyny, O'Muimhnig    
2 O'Muireadhaigh Murray    
2 O'Nuallain Nolan, Nowlan    
2 O'Ruairc Rogers, Rory    
2 O'Sealbhaigh Shelly, Shallow    
2 O'Torpa Torpy Torpey  
3 O'Cuileannain Cullennan Cullinan, Cullinane, Quillinan Cuileannan, son of Bruadar
Flann Arda, p 43
3 O'Dubhdaleithe Dowdall   Dubhdalethe, son of Dubhleanna
Flann Arda, p 43
3 Ua Dunadhaich Downey, Denny   Dunadhach son of Flaithimh
Flann Arda, p 43
3 O'Lathimh Leahy, Lahiff, Lahy Flaithimh now Flahive Flann Arda, p 43
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
4 O'Credain Credan   Tealach-Critain, p.29
Lughaidh Cal
4 Ui Finn Finn Fynn Finn son of Maccon, p.57
Ua Eidersceoil
4 Gaibhtheachain Gaughan   race of Aenghus, son of Amhalghaidh, p.30
Lughaidh Cal
4 O'Uaruisce Hourisky   Tealach-Uaruisce, p.29
Lughaidh Cal
4 Tealach-Churnain O'Curnains, O'Curnins   Tealach-Curnain, p.29
Lughaidh Cal
4 Ua Finain O'Finan   Finan son of Colman p.37
Duach: Ui Aenghusa
Fina son of Fiachra, p.63
4 Ui-Floinn O'Flynn   Ui-Floinn, who are also of the race of Aenghus, son of Amhalghaidh, p.30
Lughaidh Cal
4 Ua Cuinn Quin    
4 O'Rothlain Rowley   Rothlan, son of Mairtine, p.5
Lughaidh Mac Ith
4 O'Treabhair Trevor  Travers