Carson. Scottish origins. They were in the north of the Ulster Province.

Mac Cart (Descended from a son of Art) - Irish / Mheic Airt. A Sept / Family branch, who had their territory in the Ulster Province.

Mac Cartan - Irish / Mheic Artain / Art. A Sept / Family branch, who had their territory in Co. Down in the south - east of the Ulster Province and nearby in Co. Louth in the north - east of Northern Leinster were they were the Kings and Chiefs of Kinelearty.

Carter. Used by the Irish / Mheic Artuir to anglicize their name, and also used for Mac Arthur, which see.

Carter / Le Carter. English origins. They have been in Ireland since the 14th Century AD.

Mac Carthy or Mac Carty - Irish / Mheic Carrthaig - Carrthach (The Loving One.) A Heberian Eoghanacht Chaisil Sept / Family branch (Descended from a son of *107.Carthy / Carrthaig a grandson of  *104.Callaghan / Ceallachan "Chaisil" the great Eoghanacht 34th King of Cashel / Munster who died in 952 / 4 AD after taking on the Vikings head on and nearly succeeding. Kings in Co. Tipperary in the north - east of Ormond / Aur Mhumhain / North Eastern Munster and Kings and Princes in the north - west of Co. Cork (Dunhallow Mac Carthy) in the south - west of Co. Cork (Mac Carthy "Riabach") and Co. Kerry (Mac Carthy "Mor") and on the Co. Cork / Co. Kerry border (Mac Carthy "Muskerry").in Desmond / Des Mhumhain / Southern Munster. Ancestors: *107.Carthy / Carrthach, *106.Saerbrethach, *105.Donough / Donnchad the 38th King of Cashel / Munster, *104.Callaghan / Cellachan "Caisil" the 34th King of Cashel / Munster, *103.Buadchan, *102.Lachtnae, *101.Artgal, *100.Snedgus, *99.Donngal / Dungalach, *98.Faelgus, *97.Nad "Fraich," *96.Colgan / Colgu the 15th King of Cashel / Munster, *95.Failbe "Fland" the 11th King of Cashel / Munster, *94.Aed "Dubh," *93.Criffan / Crimthann, *92.Felim / Feidlimid the 4a King of Cashel / Munster, *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" (Eoghanachta), *84.Ailill "Oluimm" the 1st King of Munster.

Cartmill. English toponymic origins. They have been in Co. Armagh in the south - east of the Ulster Province and nearby in Co. Louth in the north - east of Northern Leinster since the early 14th Century AD.

Mac Cartney. Highland Scottish. Gaelic Irish / Mheic Cartaine. A Sept / Family branch of the Clan Mac Intosh who have been in the north - east of the  Ulster Province since the Mid - 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.

Mac Cartney. Cognate with the Irish Mac Cartan.

Mac Cartney. Used as a synonym by the O Mulhartaghs, which see - Irish / Ui Maolfhathartaigh who had their territory in Co. Tyrone in Central Ulster.

Mac Cartney. Used by the Mac Caughertys, which was already used as a synonym for Mac Cafferty, which see.

Carton. English toponymic origins. They were in the Ulster  Province. Some also used it as a synonym for Mac Cartan, which see.

O and Mac Carty - Irish / Ua / Mheic Carthaigh. Used as a derivation for Mac Carthy, which see. A Sept / Family branch, who had their territory in the Connacht Province, but were also in Co. Wexford in the south - east of Southern Leinster.

Caruth or Carruthers. Scottish origins. They have been in the Ulster Province since the 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 non - Catholic Plantations there.

Mac Carvey or Mac Carway - Irish / Mheic Cearbhaigh - cearbhach / ragged. A Sept / Family branch, who had their territory in Co. Sligo in the north - west of the Connacht Province.

Mac Carvill. Previously anglicized as Mac Carroll, which see - Irish / Mheic Cerbaill. A Sept / Family branch, who had their territory in the Ulster Province where they were noted musicians.

Mac Cary - Irish / Mheic Fhiachra. A Sept / Family branch, who had their territory in the east of Co. Galway in Southern Connacht, and nearby in Co. Westmeath in the south - west of Northern Leinster who usually anglicized as Mac Keaghry, which see. See also Mac Aree and Mac Keary.

Mac Cary - Irish / Mheic Fhearadhaigh. They were in the Ulster Province. See also - Mac Carry.

Mac Casement / Mheic Asmuint. Manx origins. A Sept / Family branch, who were in Co. Antrim in the north - east of the Ulster Province.

O Casey. - Irish / Ua Cathasaigh - cathasach (vigilant in war / watchful). A Sept / Family branch, who had their territory in Co. Westmeath in the south - west of Northern Leinster, and were also the Chiefs of Suathni in Co. Dublin nearby in the north - east of Southern Leinster.

O Casey - Irish / Ua Cathasaigh. A Heberian Dal gCais Ui Bloid Ui Turlough Sept / Family branch, who eventually had their territory in the Barony of Pubblebrien in Co. Limerick in the mid - north - west of Thomond / Tuaiscert Mhumhain / Northern Munster  where they were the Chiefs of Rathconan. They were also nearby in Co. Kerry and Co. Cork in the south - west of Desmond / Southern Munster. Ancestors: *105.Duncan / Donncuan / *105.Mahon, *104.Kennedy / Ceaneidigh, *103.Lorcan / Finghin, *102.Lachtna, *101.Corc, *100.Anluan, *99.Mahon, *98.Turlough (Ui Turlough), *97.Cathal, *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 Casey - Irish / Ua Cathasaigh - cathasach / vigilant in war / watchful. A Heberian Cianacht Sept / Family branch. Ancestors: *87.Cormac “Gailsang,” *86.Teague / Tadhg mac Cian, *85.Cian (Cianachta),*84.Ailill "Oluimm" the 1st King of Munster. Especially see - O Hara and O Gara.

Mac Casey or Mac Asey - Irish / Mheic Cathasaigh. A Heremonian Ui Cobhthaigh Ui Felim Dal Cuinn 3 Colla Sept / Family branch, who had their territory in Co. Monaghan in Orghialla / Oriel in Southern Ulster and nearby in Co. Louth in the north - east of Northern Leinster. They were also in Co. Fermanagh in the south - west of the Ulster Province, and Co. Mayo in the mid - west of the Connacht Province. Ancestors: *84.Eochy / Echu "Doimhlen," *83.Cairbre "Liffeachair" the 116th King of Tara / Ireland.

                                                                                            +On to O Cash - Mac Caughan