O Keaney or O Keany - Irish / Ua Coinne. Origins unknown as yet. They had their territory in Co. Leitrim in Northern Connacht, Co. Galway in Southern Connacht and Co. Donegal in the north - west of the Ulster Province.

O Kearnaghan. A Heremonian Ui Cobhthaigh Dal Cuinn Colla da Crioch Ui Breasail Airthir / Orior / Airthir Siol Fiachra Cassan Sept / Family branch, who had their territory in Co. Armagh in the south - east of the Ulster Province. Especially see - O Kernaghan.

O Kearney or O Carney or O Kearny - Irish / Ua Cearnaigh - cearnach / victorious. A Heberian Dal gCais Sept / Family branch, who were Chiefs of Avon / Ui Cearney (O Kearney’s River.)They had their territory at Six - Mile - Bridge in the Baronies of Tulla and Bunratty in Co. Clare in the north - west of Thomond / Tuaisceart Mhumhain / Northern Munster. They eventually settled into Cashel in Co. Tipperary in Ormond / Aur Mhumhain / Eastern Munster. (They were also in Co. Cork in Southern Munster as O Kearney). Ancestor - *91.Cas (Dal gCais)the King of Thomond.

O Kearney. A Heremonian Ui Cobhthaigh Dal Cuinn 3 Colla Sept / Family branch, who had their territory in the kingdom of Orghialla / Oriel in Southern Ulster and nearby in Co. Louth in the north - east of Northern Leinster. Ancestors - *84.Eochy / Echu "Doimhlen," *83.Cairbre "Liffeachair" the 116th King of Tara / Ireland.

O Kearney or O Carney - Irish / Ua Cearnaigh - cearnach / victorious. (Descended from *Cearnach) 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 - *Cearnach, *87.Fiachra the original 2nd King of Connacht (Ui Fiachrach), *86.Eochy "Mugmedon" the 124th King of Tara / Ireland.

O Kearney - Irish / Ua Catharnaigh - catharnach / warlike. They were a Sept / Family branch who were Chiefs of Teffia at Kilcoursey in Co. Meath in the south - east of Northern Leinster and nearby in Co. Offaly in the north - west of Southern Leinster. Many members of the Family anglicized their name to Fox  / Ua Sionnaigh, which see, which was the nickname of one of their Chiefs.

Mac Kearney or Mac Carney - Irish / Mheic Cearnaigh. (Descended from *Cearnach / victorious.) A Heremonian Ui Cobhthaigh Dal Cuinn "Northern" Ui Niaill Cenel nEogain Sept / Family branch. Ancestors - *Cearnach, *88.Eogan the 1st King of Aileach (Cenel nEogain), *87.Niall of the Nine Hostages the 126th King of Tara / Ireland (Ui Niaill).

O Kearon or O Kerrane or O Kerrivane or O Kerwan or O Kirrane. A Conmaicne Magh Rein Cenel Luachain Sept / Family branch of the Mac Dorcys / Mac Dorcey / Mac Darcy / Mheic Dorchaidhe, Mac Gourkeys, including the Ui Bathbairr, Ui Braici, Ui Buibhin, Ui Chailti, Ui Cianacain, Ui Conbhuidhe, Ui Darnaigh of the Cenel Luachain, Ui Dimusaigh, Ui Dubhain (Inis Doiri Dubhain), Ui Erailb, Ui Eturrain, Ui Gabhadain, Ui Mael Padraig, Ui Mael Suthain, Ui Muirneachain, Ui Tredmain, Tellach Tanaidhe, Tellach Cleirigh. O Doonan / O Donayne / O Donnan / O Doonane / O Dounan / O Dunnan / O Dynan, who had their territory at  Oughteragh / Carrigallen in the south of Co. Leitrim in Northern Connacht. Ancestor  -*37,Ir (Irians).

 O Kearon or O Kearns. See - Kieran. O Kearon was also used in Co. Wicklow in the south - east of Southern Leinster.

Kearse or Kearsey. Used as variants for Kierse and Kiersey, which see.

O Keary or O Keery or O Carey - Irish / Ua Ciardha - ciar / black or dark brown. A Heremonian Ui Cobhthaigh Dal Cuinn "Southern" Ui Niaill Sept / Family branch, who had their territory in Co. Kildare in Central Southern Leinster where they were the Chiefs of Carbury. Ancestor - *87.Niall of the Nine Hostages the 126th King of Tara / Ireland (Ui Niaill).

Mac Keary. Used as a variant for Mac Aree, which see, in Co. Monaghan in Southern Ulster.

O Keary. Used to abbreviate O Kilkeary, which see.

Keaser -

O Keaty - Irish / Ua Ceafhadha - ceatfhaidh / sense. A Heberian Dal gCais Sept / Family branch, who had their territory in Co. Limerick in the mid - north - west of Thomond / Tuaisceart Mhumhain / Northern Munster. Many also changed to O Keating. Ancestor - *91.Cas (Dal gCais) the King of Thomond.

O and Mac Keaveney or Mac Geaveney - Irish / Ua Geibheannaigh or Mheic Geibheannaigh. A Heremonian Ui Cobhthaigh Dal Cuinn Ui Maine Sept / Family branch, who had their territory in Co. Galway in Southern Connacht. Some also anglicized as Kavanagh, which see. Ancestors - *86.Maine "Mor" (Ui Maine), *85.Murray / Muiredach "Tireach" the 122nd King of Tara / Ireland, *80.Conn of the Hundred Battles the 110th King of Tara / Ireland (Dal Cuinn).

O Keavy - Irish / Ua Ciabhaigh - ciabhach / long locks of hair. A Sept / Family branch who had their territory  in Co. Clare in the north - west of Thomond / Tuaisceart Mhumhain / Northern Munster and nearby in Co. Galway in Southern Connacht.