O Duanny. Used as a variant for O Devany, which see.

O Ducey or O Doocey - Irish / Ua Dubhghusa - dubh (black) gus (action). A Sept / Family branch, who had their territory in Aur Mhumhain / Ormond / North Eastern Munster.

Duck. Used as a synonym for Lohan, which see / lacha (duck).

O Duddy. Especially see O Dowd.

O Dudgeon. Heberian Ciannachta Sept. See Good.

Dudgeon. Used as a variant for Dodge, which see in the west of the Ulster Province in the late 16th Century AD and then in Co. Monaghan in Southern Ulster.

O Dudley - Irish / Ua Dubhdaleithe - da (two) leithe (sides). A Sept / Family branch, who had their territory in Co. Cork in Des Mhumhain / Desmond /  Southern Munster where their name was also anglicized to O Dowdall, which see

O Dudley. Heremonian Ui Laoghaire Ui Lughaidh Cu Corb Sept / Family branch and anglicized from O Dunlaing. Especially see O Dowling.

Dudley. English toponymic origins -

O Duff or O Duffy or Duffe - Irish / Ui Duibh. Gaelic Milesian Irian Ui Laeghis Cenel Crimthainn / Ui Crimthainn Ain Sept / Family branch, who were  Kings of Creamhthainn (Maryborough.) and kinsmen to  the O Devoys / O Deevy / Ui Duibhuidhe, O Hourihan / Ui hIndreadhain who had their territory at Ballyduff in Stradbally in Co. Laois in the mid - north - west of Southern Leinster. Ancestor: 37.Ir (Irians).

O Duff or O Duffe. Actually O Duffin - Irish / Ua Dubh - black. A Sept / Family branch, who had their territory in Co. Laois in the mid - north - west of Southern Leinster where they were Chiefs.

Mac Duff / Mheic Dubh. Actually Mac Elduff, which see, who were in Co. Tyrone in Central Ulster.

Mac Duff. Highland Scottish origins in the Ulster Province.

O Dufferley. Used as a variant for O Doorley, which see, in Co. Roscommon in the east of the Connacht Province.

O Dufficey - Irish / Ua Dubhghusa. A Sept / Family branch, who had their territory in the Connacht Province. See also O Ducey.

O Duffin - Irish - originally Ua Duibhghinn with Ua Duibhinn now used. A Sept / Family branch, who had their territory in Co. Waterford in the south - east of Ormond / Aur Mhumhain / North Eastern Munster and now also found in the east of the Ulster Province and nearby in Co. Louth in the north - east of Northern Leinster.

O Duffy of Connacht - Irish / Ua Dhubthaigh / dubhthach (dark one). Heremonian Dal Cuinn Colla Da Crioch Sept / Family branch, who had Septs in Co. Galway, Co. Mayo and Co. Roscommon in the Connacht Province and Co Donegal in the north - west of the Ulster Province. They were also Chiefs in Co. Monaghan in Southern Ulster where Charles Gavan Duffy who was a founder of the Young Irelanders and who later became the Premier of Victoria in Australia and his son, Gavan Duffy originated. They also built Boyle Abbey in the 12th Century AD in Co. Meath in the south - east of Northern Leinster. See also O Duhig. Ancestors: *86.Cairbre Liffeachair the 117th King of Tara / Ireland. 87.Eochy / Echu Doimhlen, 88.Murray Colla Da Crioch - of the Two Countries / Focrith - of the Earth, 89.Fiachrach Casan, 90.Felim,  91.Feig, 92.Fiachra Ceann Fionnan,

O Dugan of Co. Wexford. A Sept / Family branch, who had their territory in Co. Wexford in the south - east of Southern Leinster where they were Chiefs and were a also nearby in Co. Cork in Desmond / Southern Munster.

O Duggan or O Dugan or O Doogan or O Deegan of Co. Clare - Irish / Ua Dubhgain / Duibhgin Dubhagain. Heberian Dal gCais Sept / Family branch, who were the Dalcassian Chiefs of Muintir Conlochta who had their territory around Tomangraney in the Barony of Tullagh in Co. Clare in the north - west of Thomond / Tuaiscert Mhumhain / Northern Munster. Ancestors: 84.Ailill Oluimm the 1st King of Munster, 91.Cas the King of Thomond.  (Dal gCais).

O Duggan or O Dugan or Doogan of Co. Cork - Irish / Ua Dubhgain. Gaelic Milesian Irian Fir Maighe Sept / Family branch, who had their territory at Caher Duggan where they were the Chiefs of Fermoy / Fir Maighe in the north of Co. Cork in Des Mhumhain / Desmond / Southern Munster. They survived until the 13th Century AD after the Anglo - Norman English Invasion when the English confiscated their territory also.Ancestors: 64.Fergus Mor the King of Ulster, 65.Fionfailig, 66.Firglin, 67.Firgil, 68.Firdeicit, 69.Cumasseagh ancestor of the O Cosgraves / Ui Coscridh, 70.Mogh Ruith who was a Druid known as Magus Rots, 71.Labhra,72.Dethi, 73.Sarglinn, 74.Suirce, 75.Laiscre, 76.Iolainn, 77.Magnan, 78.De Thaile, 79.Congan Gairin, 80.Kelly / Ceallach, 81.Dailgaile, 82.Muircheartdoig, 83.Lomaing, 84.Dubhagan ancestor of the O Duggans / Ui Dubhagain, 85.Aodh, 86.Dermod, 87.Melaghlin, 88.Conor, 89.Aodh, 90.Donnell.

O Duggan or O Dugan or O Doogan of Co. Mayo, Irish / Ua Dubhgain / Dubhagain. Heremonian Dal Cuinn Colla Da Crioch Ui Maine Sept / Family branch, who had their territory in Co. Mayo, and nearby in the east of Co. Galway and in the south of Co. Roscommon in the Connacht Province. Ancestors: *86.Cairbre Liffeachair the 117th King of Tara / Ireland. 87.Eochy / Echu Doimhlen, 88.Murray / Muireadach Colla Da Crioch - of the Two Countries.

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