O Cash. Previously O Cass or O Casse. They had their territory in the region from Co. Tipperary in the north - east of Ormond / Aur Mhumhain / Eastern Munster Province to Co. Wexford  in the south - east of Southern Leinster. The O Casse were originally O Casey, which see.

Cashall -

Cashell. Originally anglicized as Mulcashel and Mountcashel - Irish / Ua Maolchaisill. A Sept / Family branch, who had their territory in the north of the Munster Province. See also Cushlane.

O Cashell or O Cassily or O Casley or O Cassell or O Cassely or O Cushley / Ui Caisile, A Heremonian Ui Cobhthaigh Ui Felim Dal Cuinn Colla da Crioch Ui Breasail Airthir / Orior / Airthir Siol Fiachra Cassan Clann Fermaighe Muintir Caiseil Sept / Family branch, who were kinsmen to the O Kealaghan / O Keelaghan / O Kealahan / Ui Ceileachain, Mac Cadden / Mac Cadigan / Mac Adam / Mac Adan / Mheic Acadhain, O Dullahan / O Dallaghan / O Dallahan / O Dallan / O Dolghan, O Kernaghan / O Kearnaghan / Ui Cearnachain, O Madigan / Ui Madadhain, O Trainor / O Trainer / O Trayner / Ui Threinfhir. They had their territory in the north of Co. Armagh in the south - east of the Ulster Province. Ancestors: *97.Buachalla, *96.Conor / Conchobar "Chorraig," *95.Mael "Duin," *94.Fingin, *93.Ronan, *92.Toole / Tuathal, *91.Ailella, *90.Conall, *89.Feicc, *88.Bressal, *87.Felim / Feidlimid, *86.Fiachra "Cassan," *85.Murray / Muiredach "Colla da Crioch" / "Focrith"- of the Two Countries, *84.Eochy / Echu "Doimhlen,"  *83.Cairbre "Liffeachair" the 116th King of Tara / Ireland.

Cashell / de Cashel. Anglo Norman origins. They were in Co. Louth in the north - east of Northern Leinster in the 14th - 17th Century AD and were strong supporters of the Irish cause.

O Cashin or O Kissane - Irish / Ui Casain, An Irian Laeghis / Ui Laoighis Sept / Family branch of the O More / O Moore / Ui Mordha and kinsmen to O Brophy / O Brofie / Ui Broithe, O Deegan / Ui Duibhgainn, O Doran / O Dorrian / Ui Deoradhain, O Dowling / Ui Dunlaing, Mac Gahan / Mac Geehan / Mageehan / Mheic Gaethain, Mac Keady / Mac Keadie / Mac Keddy / Mac Keedie / Mac Keedy / Mackeady / Mheic Ceadach, O Harrigan / O Harraghan / O Harahan / Ui hArraghain, Ui Liathain, O Lalor / O Lawlor / Ui Leathlobhair, Mac Lee / Mac Lea / Ui Laoidhigh, O Swords / O Sord / O Sourdes / O Suard / Ui Suaird who had their territory in Co. Laois in the mid - north - west of Southern Leinster. Ancestors: *Fachtna, *Milige, *Bran, *Eircc "hUbulchind," *Felim / Feidlimid mheic Finnchad, *78.Fiachach "Uanchind," *77.Daire, 76.Rossa, *75.Ogoman, *74.Fergus, *73.Muleist, *72.Fachtna, *71.Milige (Ui Baccan), *70.Intait, *69.Lugdach "Loichsi" / Laoiseach "Ceann Mor" the ancestor of the O More / Moore / Siol Morda Sept in Co. Laois (named for him) in the north - west of Southern Leinster who were among the ”7 Septs of Laois, *68.Conall "Cernach" / of the Victories the leader of the Knights of the Red Branch of Ulster who is also the direct ancestor of the Mac Guinness, Mac Gowan and many other Irian Families in the Ulster Province and the Connacht Province. (He was a contemporary of Cuchulainn), *67.Aimhirgin "Larghiunach," *66.Cas, *65.Fachtna, *64.Cathbladh, *63.Cionga,  *62.Rory / Ruaidri “Mor” - the Greater who died in 218 BC as the Irian 86th King of Tara / Erinn the direct ancestor of all of the Irian Families from the Clann - na - Rory Sept descended from *37.Ir. (Irians).

O Cashin. A Sept / Family branch, who had their territory in Co. Galway in  Southern Connacht.

Mac Cashin - Irish / Mheic Caisin. A Medical Sept / Family branch, who had their territory in Co. Laois in the mid - west of Southern Leinster. Other variants are Cashen, Casheon, Cashion, Cashon, Cassin and Cassion.

Mac Caskey / Mheic Ascaidh. They were in Co. Derry and Co. Tyrone in the Ulster Province. Mac Askie is a variant.

O Casse - Irish / Ua Cathasaigh. See - O Cash.

O Cassell. A Heremonian Ui Cobhthaigh Ui Felim Dal Cuinn Colla da Crioch Ui Breasail Airthir / Orior / Airthir Siol Fiachra Cassan Clann Fermaighe Muintir Caiseil Sept / Family branch who had their territory in the north of Co. Armagh in the south - east of the Ulster Province. Especially see - O Cashell.

O Caslin or O Cashlane - Irish / Ua Caislealain. A Sept / Family branch, who had their territory in Co. Roscommon and Co. Leitrim in the Connacht Province.

Mac Casserley - Irish / Mheic Casarlaigh. A Sept / Family branch, who had their territory in Co. Roscommon in the east of the Connacht Province.

Casshol -

O Cassidy - Irish / Ua Caiside / curly headed. A Heremonian Ui Cobhthaigh Ui Felim Dal Cuinn Colla da Crioch Sept / Family branch, who had their territory in Co Fermanagh in the south - west of the Ulster Province where they were Chiefs at Farran / Fearann Cassidy. They were poets, scholars and physicians to their kinsmen the Maguires. Originally they were at Ballycassidy to the north of Enniskillen and also in Co. Derry and Co. Monaghan  in Ulster. Ancestors: *85.Murray / Muiredach "Colla da Crioch" / "Focrith"- of the Two Countries, *84.Eochy / Echu "Doimhlen,"  *83.Cairbre  "Liffeachair" the 116th King of Tara / Ireland.

Mac Cassidy / Mheic Asidha. A Heremonian Ui Cobhthaigh Ui Felim Dal Cuinn Colla da Crioch Siol Daim Argait (Ui Cremthainn) Clann Lugainn Sept / Family branch, of the Maguires who had their territory in Co. Tyrone and Co. Fermanagh in the south - west of the Ulster Province. Kinsmen also to Mac Alear / Mac Eleer / Mheic Gilla Uidhir, Mac Aleese / Mac Gileece / Mac Leece / Mac Illeese / Mac Leese / Mac Lice / Mac Lise etc / Mheic Giolla Iosa, Mac Anally / Mac Cowley / Mac Culloo / Mheic Con Uladh, Mac Auley / Mac Awley / Mac Gawley / Mheic Amhlaoibh. Mac Breen / Mheic Braoin, Mac Caffrey / Mac Godfrey / Mheic Gafraidh,  Mac Court / Mac Courtney / Mheic Cuairt, Mac Cormack / Mheic Cormaic, Mac Corry / Mac Gorry / Mac Godfrey / Mac Gohery / Mac Goffrey / Mheic Gothraidh, O Darragh / O Darra / O Darrough / Oaks / Ui Dubhdhara, Mac Gee / Magee / Mheic Aodh, O Heany / O Heeny / O Hegney / O Higny / Bird / Ui hEgneach, Mac Lilly / Mac Calilly / Mac Lely / Mac Lillie / Mac Alilly / Mac Alyly / Mheic Ailghile, Mac Loughlin / Mac Lachlan / Mheic Lochlainn, Mac Manus / Mheic Maghnuis, Mac Morrow / Mac Murrow / Mheic Murchada (Clann Aodh). Ancestors: *98.Lugan, *97.Irgalach, *96.Eignigh, *95.Cormac, *94.Fergus, *93.Aed, *92.Cormac, *91.Cairpre "Daim Argait," *90.Eochy / Echach, *89.Criffan / Crimthann "Leith" / "Lethan," *88.Feicc, *87.Dega "Duirn," *86.Rochatha / Rochadh, *85.Murray / Muiredach "Colla da Crioch" / "Focrith"- of the Two Countries, *84.Eochy / Echu "Doimhlen," *83.Cairbre "Liffeachair" the 116th King of Tara / Ireland.

O Cassily or O Casley - Irish / Ua Caisile. A Heremonian Ui Cobhthaigh Ui Felim Dal Cuinn Colla da Crioch Ui Breasail Airthir / Orior / Airthir Siol Fiachra Cassan Clann Fermaighe Muintir Caiseil Sept / Family branch, who had their territory in Co. Armagh in the south - east of the Ulster Province in Muintir Cassely (The People of Caisile.) Especially see - O Cashell.

Cassin. Origins unknown as yet. Cashin is used as a variant in Co. Tipperary in the north - east of Ormond / North Eastern Munster and nearby in Co. Offaly in the north - west of Southern Leinster.

Cassin - Irish / Ua Casain. A Sodhan Sept / Family branch, who had their territory in the south of Co. Galway in Southern Connacht.

Cassy -

Cather. A Wesleyan family who were in Co. Tyrone in Central Ulster.

Mac Cattigan - Irish / Mheic Aitigin (Descended from a son of Atkin) They were in Co. Mayo in the mid - west of the Connacht Province.

Mac Cathmhaoil, or Mac Campbell, which see. Irish / Mheic Cathmhaol / battle champion. A Heremonian Ui Cobhthaigh Ui Felim Dal Cuinn "Northern" Ui Niaill Cenel nEogain Cenel Fheardaigh Theas Sept / Family branch, who had their territory in Co. Tyrone in Central  Ulster where some also changed to Mac Campbell, which see. Ancestors - *88.Eogan the 1st King of Aileach (Cenel nEogain) , *86.Niall of the Nine Hostages the 126th King of Tara / Ireland  (Ui Niaill).

Mac Caughan - Irish / Mheic Eachain. A Sept / Family branch, who had their territory in Co. Antrim and nearby in Co. Derry in the north - east of the Ulster Province. Some also changed to Mac Caughey.

                                                                                     +On to Mac Caugherty - Chadwick