O Coolihan or O Couolihan - Irish / Ua Culichain. A Heremonian Ui Cobhthaigh Dal Cuinn Ui Fiachrach Sept / Family branch, who had their territory in Co. Mayo in the mid - west of the Connacht Province. Ancestors - *87.Fiachra the original 2nd King of Connacht (Ui Fiachrach), *86.Eochy "Mugmedon" the 124th King of Tara / Ireland.

O Cooling - Irish / Ua Cuifhinn. A Sept / Family branch, who had their territory in Co. Wicklow in the south - east of Southern Leinster.

 O Coombes. A Heberian Dal gCais Ui Bloid Sept / Family branch, who had their territory in Co. Clare in the north - west of the Munster Province, who are directly descended from *96.Aodh "Caomh" -  the Comely / the Gentle,  who was the King of Munster and the first Christian King of the Family, and the eldest son of *95.Conall. Ancestors - *96.Aodh "Caomh" the King of Munster, *95.Conall, * 94.Eochy / Eochaidh "Baill Dearg," *93.Cairthenn "Fionn  Oge Mor," *92.Blood / Blod (Ui Bloid), *91.Cas (Dal gCais) the King of Thomond.

O Coomey or O Cumey - Irish / Ui Cormaidhe. A Heremonian Ui Cobhthaigh Dal Cuinn Colla Uais Ui Mheic Uais Breg Sept / Family branch, who had their territory at Upper Kells / Lower Navan in Co. Meath in the south - east of Northern Leinster. Especially see - O Cormie.

O Coomey - Irish / Ua Camtha. A Sept / Family branch, who had their territory in the Heremonian Ui Cobhthaigh Dal Cuinn Ui Briuin kingdom of Breifne in Co. Leitrim in Northern Connacht and Co. Cavan in Southern Ulster. They were also in Co. Cork in Desmond /  Southern Munster.  See also next entry.

Coomey. See also - Comey.

O Cooney - Irish / Ua Cuana. A Sept / Family branch, who had their original territory in Co. Tyrone in Central Ulster, and later nearby in the north of the Connacht Province.

O Cooney. A Sept / Family branch, who had their territory in Co. Clare in the north - west of Thomond / Tuaiscert Mhumhain / Northern Munster and nearby to the north - east in the south - east at Ballycooney in Co. Roscommon and Co. Galway in Southern Connacht.

Cooper. English occupational name. They were among the "Landed Gentry" since the Mid - 17th Century AD in four Counties especially Co. Sligo in the north - west of the Connacht Province.

Coot -

Coote. (a bird.) Anglo origins. They have been in Co. Cavan in Southern Ulster, and Co. Laois in the mid - west of Southern Leinster since 1600 AD.

Copeland. They were in Co. Down in the south - east of the Ulster Province.

Copley. English toponymic origins. They have been in Co. Cork in Desmond / Southern Munster since 17th Century AD.

Coppinger. Danish origins. They have been in Co. Cork in Desmond / Southern Munster since the early 14th Century AD.

Coply -

Corbally. From an Irish place name. They were in Co. Louth in the north - east of Northern Leinster  where Corballis is also used.

Corbane or Corban - Irish / Ua Corbain. A Sept / Family branch, who had their territory in the Munster Province.

Corbett / Corbet. Anglo - Norman origins. They had ravens in their arms and initially came from Shropshire in England. In Ireland it is usually similar to O Corban(e) / Ua Corbain in the Munster Province or O Coirbin in the Connacht Province and O Corribeen in Co. Galway and Co. Mayo in the south - west of Connacht, which see.

Mac Corby or Mac Corboy - Irish / Mheic Corrbhuidhe - cor / crane / buidhe - yellow. A Sept / Family branch, who had their territory in Co. Laois and Co. Offaly in the north - west of Southern Leinster, and also nearby in the north of Co. Tipperary in the north - east of Ormond / North Eastern Munster.

O Corcoran - Irish / Ua Corcrain - corcra / corcair / purple. An Ecclesiastical Sept / Family branch, who had territory in Co. Fermanagh in the south - west of the Ulster Province near Loch Erne. Also anglicized as O Corkery and O Corkin, which see. O Cochrane was also used as a variant.

Mac Corcoran - Irish / Mheic Corcrain - corcair / purple. A Heberian Cianachta Sept / Family branch, who had their territory in Co. Offaly in the north - west of Southern Leinster. They were also Chiefs nearby in Co. Tipperary in the north - east of Ormond / Aur Mhumhain / North Eastern Munster of the Clann Ruainni in "Ely - O Carroll Country." Mac Cochrane also used as a variant. Ancestors - *84.Teague mac Cian, *85.Cian (Cianachta), *84.Ailill "Oluimm" the 1st King of Munster, *37.Heber "Fionn" (Heberians)

Mac Cord. May be a variant of Mac Court, which see, in the Ulster Province.

                                                                                     +On to O Cordan - Cornwalsh