O Dea or Day or Daw or O Dee or O Deedy or Godwin - Irish / Ua Deaghaidh. Heberian Dal gCais Cenel Cuallachta Sept / Family branch, who were the Chiefs of Triocha Cead Cinel Fermaighe / Triocha Uachtarach / The Upper District and Dysert Ui Deadhadh / Dysert O Dea in the Parish of Dysert / Barony of Inchiquin in Co. Clare in the north - west of Thomond / Tuaisceart Mhumhain / Northern Munster of 24,000 acres near Inchiquin. They were one of the main Dalcassian Septs in Co Clare who also anglicized their name as Godwin in Co. Mayo in the mid - west of the Connacht Province and also as Day and Daw, which see and were also Chiefs in Co. Cork in Des Mhumhain / Desmond / Southern Munster and Kings in Co. Tipperary in the north - east of Aur Mhumhain / Ormond / North - Eastern Munster.  Septs: The Cenel Fearmaic, the Cenel Baoi, the Cenel Cualochtaig / Cuallachta, and the O gRiobta Sept who was originally their main Family. A Sept early on went into Slieve Aradh / Slivearadh in Co. Tipperary where they had several castles as they also had as Cinel Fearmaic. O Dee was sometimes used incorrectly. Ancestors: 125.Michael Oge  - the Younger O Dea.124. Michael Dea, 123.Conor Cron - the Swarthy, 122.Lochlann Riabach, 121.Shane, 120.Lochlann, 119.Conor, 118.Edmond, 117.Donnell, 116.Lochlann, 115.Donogh, 114.Rory / Ruadhri, 113.Patrick / Padraic, 112.Flaherty Fionn, 111. Lochlann, 110.Flaherty, 109.Mureadach, 108.Giall Gaire, 107.Aichear, 106.Donogh whose older brother, 106.Conn Mor is the ancestor of the O Quinns of Munster from the Muintir Cuinn, and younger brother 106.Flaherty / Flaithbertach is the ancestor of the O Roughans, 105.Deadha is the direct ancestor of the O Deas / Ui Deaghaidh, 104.Donnell, 103.Donn, 102.Dubnhsalach, 101.Flancha,100.Flann Scrupuil, 99.Fercionn / Fercinn is the direct ancestor of the Perkins / Ui Fercinn 98.Fermac is direct ancestor of the Cinel Fearmaic, 97.Cuacta / Cuallta the ancestor of the O Kieltys / O Quiltys / Wolfs / Ui Cualltaigh, 96.Dunsleibhe, 95.Diomma, 94.Seanach, 93.Rethach, 92.Angus / Aeneas Cinnathrach a brother to 92.Blod the ancestor of the Ui Bloid Sept, who was the eighth son of 91.Cas the King of Thomond / Northern Munster. (Dal gCais).

O Dea - Slieveadagh Co. Tipperary

O Deady - Irish / Ua Deadaigh. O Daoda is a variant that was also used that was anglicized as O Dady, which see. A Sept / Family branch, who had their territory in Co. Kerry and Co. Limerick in the west of the Munster Province.

O Deakin or O Deacon - Irish / Ua Deacain -

Deakin or Deacon. English origins in Ireland in the 17th Century AD.

Mac Deale.  In Co. Armagh in the south - east of the Ulster Province in 1664 AD.

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

Mac Deane - Irish / Mheic an Deaganaigh - deaghan (dean). A Sept / Family branch who had their territory in Co. Donegal in the north - west of the Ulster Province.

Deane / le Den. One of the 14 foreign Tribes of Galway who were in Co. Galway  in Southern Connacht. See also Dane in the north of Connacht Province.

Deane / le Denne. They were in the O Kennedy's Heberian kingdom of Ormond / North - Eastern Munster in Co. Kilkenny / Ossory in the south - west of Southern Leinster and the surrounding territory in Co. Tipperary.

De Angulo or Nangle. Descended from Gilbert de Angulo One of the Anglo - Norman Barons subject to Hugh de Lacy during the Anglo - Norman Invasion under Henry 11, and also from his son, Jocelyn de Angulo / Nangle. Gilbert de Angulo's father was Oisdealb, and some changed to Nangle, and or Mac Costello / Costelloe / Mac Oisdealbhaigh  

O Deany or O Deanie. Used as variants for O Denny, which see, in the Ulster Province and sometimes for O Deeney, which see. See also Dealy.

Dease / Deise. They had their Estates in Deece in Co. Westmeath in the south - west of Northern Leinster since the 13th Century AD and were also in Co. Meath.

O Deasy - Irish / Ua Deiseach (of the Decies). Heremonian Ui Cobhthaigh Ui Felim Sept / Family branch, who had their territory in Co. Waterford in the south - east of the Munster Province who are now mainly to be found in Co. Cork in Desmond / Southern Munster. Ancestors: *82.Felim / Feidhlimidh Reachtmar - the Lawgiver the Heremonian Ui Cobhthaigh 108th  King of Tara / Ireland. (Ui Felim).

Mac Deasy - Irish / Mac an Deisigh. A Sept / Family branch, who may have had their territory in Co. Sligo in the north - west of the Connacht Province?

De Bathe - Anglo - Norman Barons of Athcarn who had their territory in Midhe in Northern Leinster. See Bath.

De Constantine. See Constantine.

O Deegan - Irish / Ui Duibhgainn, dubh (black) ceann (head). Gaelic Milesian Irian Laeghis Ui Laoighis Sept / Family branch, who were the Keepers of the Bell of St. Molua. from the O More / O Moore / Siol Mordha Sept who were also kinsmen to O Brophy / O Brofie / Ui Broithe, O Cashin / O Kissane / Ui Casain,  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 at Cloncouse 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.Ogomain, 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 male line 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).

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

O Deehan - Irish / Ua Diochon. A Sept / Family branch, who had their territory in Co. Derry in the north - east of the Ulster Province. Sometimes changed to Dickson, Also see Deighan.

O Deeley - Irish / Ua Duibhghiolla - dubh (black) giolla (lad). A Sept / Family branch, who had their territory in Co. Galway in Southern Connacht. See also O Devilly, which was used as a synonym.

O Deenihan or O Dinaghan - Irish / Ua Duibhneachain. A Sept / Family branch, who had their territory in Co. Limerick in the mid - north - west of Tuaisceart Mhumhain / Thomond / Northern Munster who are now mainly in Co. Kerry in the south - west of Desmond / Southern Munster.