Mac Cunreen - Irish / Mheic Conriain. (Descended from a son of Ryan's Hound or Warrior) A Sept / Family branch, who had their territory in Co. Roscommon in the east of the Connacht Province, who also changed their name to King, which see.

Mac Cuolahan - Irish / Mheic Uallachain - uallach (proud). Heremonian Dal Cuinn Colla Da Crioch Ui Maine Siol Anmchadha Sept / Family branch, who had their territory in the Barony of Garrycastle in Co. Offaly in the north - west of Southern Leinster

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O Cuolahan or O Coolican - Irish / Ua Cuachain. Heremonian  Dal Cuinn Ui Fiachrach Sept / Family branch, who had their territory in Co. Mayo in the mid - west of the Connacht Province. O Coolican was also used as a variant. Ancestors: 90.Fiachra the second Dal Cuinn King of Connacht  (Ui Fiachrach), *89.Eochy Mugmedon the 124th King of Tara / Ireland.

Mac Curdy - Irish / Mheic Mhuircheartaigh. A Sept / Family branch, who had their territory in Co. Antrim in the north - east of the Ulster Province. Also used as a variant for Mac Murty and Mac Brearty, which see.

Mac Curley or Mac Terry - Irish / Mheic Toirdhealbhaigh. Used as a variant by the Mac Turleys from the Ulster Province, which see, in Co. Galway and Co. Roscommon in Southern Connacht where there is Ballymacurley and Curley's Island in Co. Roscommon.

O Curnane - Irish / Ua Curnain  an early form of O Courtney, which see, used in Co. Kerry in the south - west of Desmond / Des Mhumhain / Southern Munster.

O Curneen - Irish / Ua Cuirnin. An Ollav Sept to the Heremonian Dal Cuinn Ui Briuin O Rourkes, which see, in their kingdom of Breifne who had their territory in Co. Leitrim in Northern Connacht. Ancestors: 90.Brion the first Dal Cuinn King of Connacht (Ui Briuin),  *86.Eochy Mugmedon the 124th King of Tara / Ireland.

O Curnin or O Curnan, or O Curnen - Ollamh / Uai Cuirnin. Gaelic Milesian Irian Conmaicne Rein Muinter Eolais Tellach Cearbhallan Sept / Family branch, who were kinsmen to the O Beglin / O Beglan / O Beglain / O Begnal / O Beglane / O Biglane / O Beglen / O Begllin / O Biglan / O Beglyn / Ui Beigleighinn, O Boden / Ui Bardain, O Hallissy / Ui hEolusa, O Mulvey / O Mulveagh / Ua Maoil Mhiadhaigh, O Murray / O Morie / O Morra / O Morrie / O Morey / O Mory / O Murry / O Murrie / Ui Muireadhaigh, O Mulhooly / O Mulhooghley / O Mulooley / O Hoogley / Ui Maoil Ghuala, Mac Mullock / Mac Meelick / Mac Moleg / Mac Moolick / Mac Mullicke / Mac Mulock who had their territory at Mohill and Leitrim in Co. Leitrim in Northern Connacht. Ancestors: Finer, Cumscrach, 37.Ir (Irians).

Mac Curphy - Irish / Mheic Mhurchadha. A Manx form of Murphy used in the Ulster Province.

Curragh. An Irish toponymic in Southern Ulster and nearby in Co. Louth in the north - east of Northern Leinster in the Heremonian Ui Cobhthaigh UI Felim Dal Cuinn 3 Colla  kingdom of Orghialla / Airghialla / Oriel since the 15th Century AD.

Mac Curragh. Highland Scottish originsused as a variant of Mac Currach, which see, a branch of the Mac Phersons.

O Curran - Iris / Ua Currain. Later Ua Corrain used. Heremonian Dal Cuinn Colla Da Crioch Ui Maine Sept / Family branch, who had their territory in the south - west of Co. Galway in Southern Connacht and Co. Leitrim in Northern Connacht and were kinsmen to the O Maddens.

O Curran. A Sept / Family branch, who had their territory in Co. Clare in the north - west of Thomond / Tuaiscert Mhumhain / Northern Munster.

O Curran. A Sept / Family branch, who had their territory in Co. Waterford and nearby in Co. Tipperary in the east of Ormond / Aur Mhumhain /  Eastern Munster.

O Curran. A Sept / Family branch who had their territory in Co. Kerry in the south - west of Desmond / Des Mhumhain / Southern Munster. It was later changed to O Currane.

O Curran. A Sept / Family branch, who had their territory in Co. Donegal in the north - west of the Ulster Province. Originally it may have been O Curreen, which see, which was also changed to O Curren.

O Curran - Irish / Ua Cuirrin. A Sept / Family branch who were bards and historians who had their territory in Co. Leitrim in the north - west of the Connacht Province in the Ui Briuin Breifne kingdom of West Breifne.