Cordue. May be for an English toponymic, Cardew.

O Corduff or O Carduff - Irish / Ua Corrdhuibh. A Sept / Family branch, who had their territory in Co. Donegal in the north - west of the Ulster Province who were also in Co. Mayo in the mid - west of the Connacht Province.

Corey. They were in Co. Tyrone in Central Southern Ulster where it was used as a synonym for Corry, which see.

Mac Corgabhain. A Sept / Family branch who had their territory in Co. Longford in the north - west of Northern Leinster.

O Corkery - Irish / Ua Corcora. See O Corcoran.

Mac Corkell or Mac Corkhill. Scottish origins. Gaelic Irish / Mheic Thorcaill / Norse / Thor, A Sept of the Gunns who were in Co. Donegal and Co. Derry in Northern Ulster. Corkhill used on the Isle of Man.

O Corkery - Irish / Ua Corcra - corcair (purple). A Sept / Family branch, who had their territory in Co. Cork in Des Mhumhain / Desmond / Southern Munster.

O Corkin or O Corken - Irish / Ua Corcain. A Sept / Family branch, who had their territory in the Ulster Province.

Mac Corkin - Irish / Mheic Corcain. A Sept / Family branch, who had their territory in Co. Wicklow in the south - east of Southern Leinster.

Mac Corless - Irish / Mheic Coirleasa. Later shortened to Mac Cathail / Carluis. A Heremonian Ui Cobhthaigh Dal Cuinn Colla Da Crioch  Ui Maine Sept / Family branch, who had their territory in Co. Galway in Southern Connacht. Ancestors:

O Corley -

Mac Corley. Used as a variant for Mac Curley, which see, who were in Co. Mayo and Co. Sligo in the north - west of the Connacht Province.

O Cormac. A Sept / Family branch, who had their territory in Co. Down in the south - east of the Ulster Province.

Cineal Cormac or Cormack or Cormick of Munster. Irish / Mac Cormaic. Heberian Eoghanacht Chaisil Sept / Family branch who were kinsmen to the Mac Carthys. Ancestors: 98.Cudruin, 97.Cu Cearthach, 96.Ronan. 95.Cormac the direct male line ancestor of the Cineal Cormaic, 94.Cabhsan, 93.Fearedhach, 92.Nathi a brother to 92.Felim / Feidlimid the 4a King of Cashel / Munster who was the ancestor of the Mac Carthys. 91.Angus / Oengus the 3rd King of Cashel / Munster, 90.Nad Froich the 2nd King of Cashel / Munster, 89.Conall Corc the 1st King of Cashel / Munster, 85.Eoghan Mor the ancestor of all of the Eoghanacht Septs, 84.Ailill Oluimm the 1st King of Munster.

Mac Cormack or Mac Cormick - Irish / Mheic Cormaic. Heremonian Dal Cuinn Colla Da Crioch Siol Daim Argait (Ui Cremthainn) - Clann Lugainn Sept / Family branch, of the Maguires, who had their territory in Co. Fermanagh in the south - west of the Ulster Province and nearby in Co. Longford in the north - west of Northern Leinster where they were Kings and Chiefs. Kinsmen also to Mac Alear / Mac Eleer, Mac Aleese / Mac Gileece / Mac Leece / Mac Illeese / Mac Leese / Mac Lice / Mac Lise etc, Mac Anally / Mac Cowley / Mac Culloo, Mac Auley / Mac Awley / Mac Gawley, Mac Breen, Mac Caffrey / Mac Godfrey, Mac Cassidy, Mac Court / Mac Courtney, Mac Corry / Mac Gorry / Mac Godfrey / Mac Gohery / Mac Goffrey, O Darragh / O Darra / O Darrough / Oaks, Mac Gee / Magee, O Heany / O Heeny / O Hegney / O Higny / Bird, Mac Lilly / Mac Calilly / Mac Lely / Mac Lillie / Mac Alilly / Mac Alyly, Mac Loughlin / Mac Lachlan, Mac Manus, Mac Morrow / Mac Murrow (Clann Aodh). See also Cormican. Ancestors: 101.Lugan, 100.Irgalach, 99.Eignigh, 98.Cormac, 97.Fergus, 96.Aed, 95.Cormac, 94.Cairpre Daim Argait, 93.Eochy / Echach, 92.Criffan / Crimthann Leith / Lethan, 91.Feicc, 90.Dega Duirn,3  89.Rochatha / Rochadh, 88.Murray / Muireadach Colla Da Crioch - Champion of the Two Countries, 87.Eochy / Echu Doimhlen, *86.Cairbre Liffeachair the 117th King of Tara / Ireland.

Mac Cormack or Mac Cormick or Mac Cormican. Heberian Dal gCais Ui Bloid Sept / Family branch, who had their original territory in Co. Clare in the north - west of the Munster Province and in Co. Tipperary in the north - east of Ormond / Aur Mhumhain / North Eastern Munster. See also Cormican. Ancestors: 91.Cas the King of Thomond (Dal gCais), 92.Blood / Blod (Ui Bloid), 93.Cairthenn Fionn Oge Mor, 94.Eochy / Eochaidh Baill Dearg, 95.Conall, 96.Aodh Caomh the King of Munster, 97.Cathal, 98.Turlough / Toirdhealbhach (Ui Turlough), 99.Mahon, 100.Anluan, 101.Corc, 102.Lachtna, 103.Lorcan / Fingin. 

O Cormican or Mac Cormack - Irish / Ua Cormacain. Heberian Dal gCais Ui Bloid Sept / Family branch, who had their territory in  Tuaiscert Mhumhain / Thomond / Northern Munster. See especially Mac Cormack. Ancestors: 94.Angus / Oenghus, 93.Cairthenn Fionn  Oge Mor, 92.Blood / Blod (Ui Bloid), 91.Cas the King of Thomond. (Dal gCais)

O Cormican - Irish / Ua Cormacain. A Sept / Family branch, who had their territory in Co. Galway and Co. Roscommon in Southern Connacht. See also Mac Cormack.

Mac Cormick. Heremonian Dal Cuinn Colla Da Crioch Siol Daim Argait (Ui Cremthainn) Clann Lugainn Sept / Family branch, of the Maguires, who had their territory in Co. Fermanagh in the south - west of the Ulster Province and nearby in Co. Longford in the north - west of Northern Leinster where they were Kings and Chiefs. Especially see Mac Cormack.

O Cormie or O Cormy or O Cormey or O Coomie or O Cumey / Ui Cormaidhe. Heremonian 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, who were kinsmen to O Ennis / Ui hInnascaigh, O Devine / O Devane / O Devin / Ui Dubheoin, O Minnegan / O Minnican / Ui Minnegain. Ancestors: *88.Carroll / Carioll Colla Uais the 121st King of Tara / Ireland, *87.Eochy / Echu Doimhlen, *86.Cairbre Liffeachair the 117th King of Tara / Ireland.

Mac Cormilla. Used as a synonym for Gormley, which see, in Co. Monaghan in Southern Ulster.

Corneely. Used as a variant for Conneely, which see, who were in Co. Galway in Southern Connacht.

Corner /  cornier / horn blower. French - Anglo origins in Co. Armagh in the south - east of the Ulster Province since the late 17th Century AD after the confiscation of the 3,500,000 acres of the Heremonian Ui Cobhthaigh Dal Cuinn "northern" Ui Niaill territories there, and the foreign non - Catholic plantations there.

Corner. A locative name in Co. Armagh in the south - east of the Ulster Province since the late 17th Century AD after the confiscation of the 3,500,000 acres of the  Heremonian Dal Cuinn "northern" Ui Niaill territories there, and the foreign non - Catholic plantations there.

Cornewalles or Cornwalles or  Cornwalsh -