Mac Caughey or Mac Cahey - Irish / Mheic Eochaidh. A Sept / Family branch, who had their territory in Co. Tyrone in Central Ulster. During the 11th Century AD in Ulster, the sons and grandsons of Eochaidh mac Ardghail, and also later another of his descendants took up his name Mac Eochada or Ua hEochada / Mac or O Caughey, Haughey / Hoey. Despite this in Co. Down in the south - east of Ulster some of the Cahey, Caughey and Mac Cahy there were originally O Mulcahy, which see.

Mac Caughley or Mac Caffelly - Irish / Mheic Eachmhilidh - each / horse - mileadh / warrior. An Irian Sept / Family branch, of the *Mac Guinness, which especially see, who had their territory in Co. Down in the south - east of the Ulster Province. Mac Cawley also used as a synonym, which see. Ancestor: *62.Rory "Mor" (Clann Rory), *37.Ir (Irians).

Mac Cauley. See - Mac Auley.

Caulfield. English origins. They were in the Ulster Province. Used also as a synonym for Mac Call, Caffrey and Gaffney and sometimes for Mac Keown and for the English name, Calfhill, which see.

Mac Causland. Originally Mac Absolom - Irish / Mheic Ausalan. Highland Scottish origins. A Heremonian Ui Cobhthaigh UI Felim Dal Cuinn "Northern" Ui Niaill Cenel nEogain Clann Clann Conchobair Clan Drugain Sept / Family branch. They have been in Co. Derry and Co. Tyrone in the Ulster Province since the Mid - 17th Century AD. They are kinsman to their most important Sept the O Cahans / O Kanes and the Clann Drugain. They are descended from 96.Conor / Conchobar a brother to 96.Aed "Allan" the 155th King of Ireland and 96.Niall "Frossach" the 157th King of Ireland. Ancestors: *96.Conor, *95.Fergal the 151st King of Tara / Ireland, *94.Mael "Duin," *93.Mael "Fithrich," *92.Aed "Uaridnaich, *89.Murray / Muiredach the 2nd King of Aileach, *88.Eogan the 1st King of Aileach (Cenel nEogain), *87.Niall of the Nine Hostages the 126th King of Tara / Ireland (Ui Niaill).

Mac Cavana - Irish / Mac an Mhanaigh - manach / monk. Used for Mac Evanny, which see in Co. Antrim in the north - east of the Ulster Province.

Cavanagh or Kavanagh. A Heremonian Ui Laoghaire Ui Lughaidh Cu Corb Ui Cheinnselaig Mac Murrough Sept / Family branch, who had their territory in Co. Carlow and nearby in Co. Wexford  in the south - east of Southern Leinster where they were Kings. (Descended from *111.Diarmait Mac Murrough "na Gall" - of the Foreigners the 56th King of Leinster in 1169 AD.) He was descended from *92.Enna "Cennsalach" the Cu Corb 2nd King of Leinster the direct ancestor of the Ui Cheinnselaig Sept ,who was a grandson of *90.Bressal "Belach" the Cu Corb 1st King of Leinster. Their near kinsmen were the Mac Murroughs and Kinsellas.  Ancestors: *114.Donnell / Domhnall "Caomh," *113.Diamait mac Murrough "na Gall" the 65th Ui Cheinnselaig King and 59th King of Leinster, *112.Donough / Donnchad mac Murrough the 63rd Ui Cheinnselaig King and 56th King of Leinster, *111.Murrough / Murchad the 51a King of Leinster, *110.Dermot / Diarmait mac Mael "Na mBo" the 61st Ui Cheinnselaig King and the 51st King of Leinster, *95.Criffan / Crimthann the 1st Ui Cheinnselaig King and the 3rd King of Leinster, *94.Enda / Enna "Cennsalach" (Ui Cheinnselaig) the 2nd King of Leinster, *93.Labraid "Laidech," *92.Bressal "Belach" the 1st King of Leinster, *91. Fiachu "Ba hAiccid,"*90.Caher / Cathair "Mor" the 109th King of Tara / Ireland, *84.Cu "Corb," *37.Heremon (Heremonians).

Cavendish. English name. Used by the O Kevanes and Kavanaghs, which see, as a synonym.

Mac Caverty. See - Mac Cafferty.

Mac Cavey - Irish / Mheic Dhaibhidh. Similar to Mac Davitt.

Mac Cavish - Irish / Mheic Thamhais. Similar to the Scottish Mac Tavish. They were in Co. Cavan in Southern Ulster were they both have been changed to Thomson or Thompson. Also see Holmes.

Mac Caw - Irish / Mheic Adaimh. (Descended from a son of Adam) They were in Co. Cavan in Southern Ulster but are now in Co. Antrim  in the north - east of the Ulster Province.

Mac Cawell - Irish - Mheic Cathmhaol / battle chief. Used for Mac Campbell, which see, in Co. Tyrone in Central Ulster, and also as a synonym for Mac Call, which see.

O Cawley. A Sept / Family branch, who had their territory in Co. Galway in Southern Connacht where they were Chiefs. See especially - Mac Auley.

Mac Cawley. A variant used for Mac Awley, which see, who were in the Connacht Province and nearby in Co. Fermanagh in the south - west of the Ulster Province.

O Cawlin or O Caulin. Synonyms used for O Callan, which see, in the Heremonian Ui Cobhthaigh Ui Felim Dal Cuinn 3 Colla kingdom of Oirghialla / Oriel in Southern Ulster and Co. Louth in the north - east of Northern Leinster. In Co. Cork in Desmond / Southern Munster Coughlan, which see, pronounced as Coholan is similar to Cawlin and was written down there also creating confusion with Cohalan.

Mac Cay. Used as variant for Mac Kay, which see, in the Ulster Province.

O Cein - Irish / Ua Chein. A Sept / Family branch, who had their territory in Co. Tipperary in the north - east of Ormond / Aur Mhumhain / North Eastern Munster.

Chadwick -

                                                                                         +On to O Chaff - Cherry