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Corcu Loígde DNA Project

Pre-Eóganachta Rulers of Munster, Ireland
  • 207 members

About us

2019 (introduced)

Corca Laidhe Surnames and their Terminal SNPs

Last Updated: 09 Nov 2019

The purpose of the chart below is to tabulate the Corca Laidhe surnames listed on our Background page with the SNPs we know of to date. The chart will continually be updated as members choose to fully participate and to acquire SNP data.

The chart splits members with known ancestry from Cork/Kerry (the anchor region) from elsewhere. It is an experiment, just a starting point to see where it leads. Known ancestry from Cork/Kerry does not necessarily prove Corca Laidhe ancestry, nor does known ancestry from elsewhere necessarily disprove it.

Opinions on distributions of surnames in Ireland are based on Griffith's Valuation and the 1901 census. These sources do not necessarily reflect the distribution of surnames from the 11th and 12th centuries. The Irish moved within the country en masse during and after significant events / battles and to look for work opportunities in major industrial areas, such as Belfast and Dublin.

No doubt the composition of the table will change as we learn more. We could, for instance, shift the anchor region in the chart from Cork/Kerry to a Corca Laidhe corridor running from Kerry through Cork and up through Kilkenny.

Surname Distribution Codes
sci Multiple occurrences of surname through Ireland, maybe polygenetic origins
sriRare surname through Ireland
srsRare surname in Cork/Kerry but appears elsewhere in Ireland
scl Occurs in Cork/Kerry with a relatively heavier distribution than the rest of Ireland
Cork/Kerry SNP Distribution Codes
ssSNP has multiple occurrences in Ireland (not necessarily in the project) and appears largely or exclusively associated with this surname
scSNP has multiple occurrences in Ireland and appears associated with multiple names
sri SNP is rare in Ireland or rare in general; may be a recent discovery; anticipating more occurrences
SNPs from Other Areas

- Country abbreviations: CANada, IREland, SCOtland, ENGland, WALes, MANn, USA, more to be added when needed...
- Regional abbreviations for other Ireland counties: ANTrim, ARMagh, CARlow, CAVan, CLAre, DONegal, DOWn, DUBlin, FERManagh, GALway, KID Kildare, KIK Kilkenny, LEX Laois, LET Leitrim, LIMerick, LDY Londonderry, LOG Longford, LOU Louth, MAYo, MEAth, MOG Monaghan, OFFaly, ROScommon, SLIgo, TIPperary, TYRone, WATerford, WEM Westmeath, WIClow

0. History of the Race of Lughaidh, Son of Ith
Ua BaireBarr, Barry sciR-BY152622(SCO)
1. Genealogy of the Corca Laidhe
Ua EidersceoilDriscollscl I-A13664 ss, I-A19162 ss, I-Y112683 ss, I-BY37208 ss, R-BY75748 sri
2. Hereditary Proprietors - Country of Gillamichael
2. Hereditary Proprietors - Tuath Ui Chonneid
Ua ChaingneCagney sci R-Y31629 (LIM)
2. Hereditary Proprietors - Tuath o'hAenghusa
Ua DubhainDuanesci 
 Kidneyscl R-M222 sc
O'Sinnaigh Shinnick sri R-FT20917 sri
2. Hereditary Proprietors - Tuath O'Fithcheallaigh
 Fehillyscl R-FGC35999 sri
O'h-IarnainHernon sci  R-S15280 (TIP)


Haplogroups, Clades and SNP Testing

The notation used is that of the short hand notation for the haplogroup followed by a clade name if appropriate. Persons in this project are classified by the terminal haplogroup be it a confident prediction or known by testing  A clade here is defined as subgroup of individuals within a haplogroup who have or nearly have a common set of key STR markers.

This diagram and table below show the distribution of Haplogroups in the project as of February 2014. The Haplogroup R1b is a set of haplotypes whose terminal SNP could not be predicted with confidence, they need to be SNP tested in order to be of value to the project.

The pie graph shows a significant number of I2-L161 Isles A within the project. That is what differentiates the Corca Laidhe on the whole from other Irish tribes.

Mega testing, i.e. thousands of SNP tested at once, has come of age and project participants are encouraged to do such testing. The testing is discovering new SNP and advancing the phylogentic tree to haplogroups founded closer and closer to the present. To discover the haplogroup distribution in a tribe on the order of 1,000 years old we need to be able to characterize project participants by haplogroups that are also on the order of 1,000 years old. 

Mega Test Vendor
Geno2 National Geographic
Chromo2 Irelands DNA

Haplogroup Count Per Cent
G2-P303 1 1%
I1-Z138 2 2%
I2-L161 Isles A 12 13%
I2-L161 Isles C 1 1%
R1a Norse 1 1%
R1b 17 18%
R1b-CTS4466 South Irish 25 27%
R1b-DF21 2 2%
R1b-DF27 1 1%
R1b-DF49 1 1%
R1b-L1066 1 1%
R1b-L2 1 1%
R1b-L21 Combo-C 1 1%
R1b-L21 Combo-D 1 1%
R1b-L21 Ely Carroll 2 2%
R1b-L21 Irish IV 4 4%
R1b-L362 1 1%
R1b-L513 1 1%
R1b-M222 9 10%
R1b-P312 1 1%
R1b-P314.2 3 3%
R1b-Z145 2 2%
R1b-Z255 1 1%
R1b-Z2961 1 1%
  92 100%
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