Mac Fadden or Mac Fadyen - Irish / Mheic Phaidin - Padraig / Patrick (Descended from a son of Patrick) A Sept / Family branch, who had their territory in Co. Donegal in the north - west of the Ulster Province. They were also in Co. Mayo in the mid - west of the Connacht Province without the Mac. See also - Patterson.

Mac Fadden or Mac Fadyen. Highland Scottish origins. They were in the Ulster Province. See also Patterson.

O Faddigan. A Heremonian Ui Cobhthaigh Dal Cuinn Colla da Crioch Cenel Rochada Fernmag / Fer Fermaighe / Farney Sept / Family branch, who had their territory in the kingdom of Orghialla / Airghialla / Oriel in Co. Monaghan in Southern Ulster near Clones and they have also been nearby in the Barony of Ardee in Co. Louth in the north - east of Northern Leinster since the 15th Century AD. Especially see - O Fedegan.

O Fagan - Irish / Ua Faodhagain. A Heremonian Ui Cobhthaigh Dal Cuinn 3 Colla Sept / Family branch, who had their territory in the east of the kingdom of Orghialla / Airghialla  / Oriel in Co. Louth in the north - east of Northern Leinster. Now usually known as O Fegan. 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.

Fagan. Norman origins. They were in Co. Dublin in the north - east of Southern Leinster and nearby in Co. Westmeath in the south - west of Northern Leinster.

Faggy. Used as a synonym for Mac Fadyen in Co. Fermanagh in the south - west of the Ulster Province.

O Faherty - Irish / Ua Fathartaigh. A Sept / Family branch, who had their territory in Co. Galway in Southern Connacht on the east side of Loch Corrib. Often changed to O Flaherty. See also - O Faverty.

O Fahy or O Faghy - Irish / Ua Fathaigh - fathagh / foundation. A Heremonian Ui Cobhthaigh Dal Cuinn Ui Maine Sept / Family branch, who had their territory at Loughrea in Co. Galway in Southern Connacht known as Pobal Muintir Ui Fhathaigh / O Fahy's Country where is Fahysvillage. Some also changed to Green as a synonym due to faithche / green. Also see Fay. Ancestors - *86.Maine "Mor" (Ui Maine), *85.Murray / Muiredach "Tireach" the 122nd King of Tara / Ireland, *80.Conn of the Hundred Battles the 110th King of Tara / Ireland (Dal Cuinn).

Fair. See - Phair.

Fairfax -

O Fairy - Irish / Ua Fearadhaigh. A Heremonian Ui Cobhthaigh Dal Cuinn "Northern" Ui Niaill Cenel Conaill Sept / Family branch, who had their territory in Co. Donegal in the north - west of the Ulster Province. Ferry used nearby in in Co. Sligo in the north - west of the Connacht Province. See also - Mac Aree. Ancestors - *88.Conail "Gulban" the 1st King of Tir Conaill / Tyrconnell (Cenel Conaill),, *87.Niall of the Nine Hostages the 126th King of Tara / Ireland (Ui Niaill).

Falconer or Falkiner. English origins. They were in the Ulster Province. Also used as a synonym for Fealy and Falvey, which see, in Co. Kerry in the south - west of Desmond / Des Mhumhain / Southern Munster and Faulkney in Co. Mayo in the mid - west of the Connacht Province. Faulkner used in Co. Derry in the north - east of Ulster. See also Faughnan.

Fall. See - Lavelle.

Mac Fall. Used as a synonym for Mulfaal, which see, in the Ulster Province.

O Fallaher - Irish / Ua Faolchair / dear wolf. A Sept / Family branch, who had their territory in Co. Clare in the north - west of Thomond / Tuaiscert Mhumhain / Northern Munster. Also used also as a synonym for Falvey, which see. Flaher in Co. Tipperary in the north - east of Ormond / North Eastern Munster may be a variation?

Mac Fallon or Mac Folan or Mac Foland or Mac Folane - Irish / Mheic Fualain. An Irian Conmaicne Mara Brehon Sept / Family branch, who had their territory in the Connemara in the west of Co. Galway in the Connacht Province. Kinsmen to O Kealy / O Queally, O Devany / Ui Dubhain. Especially see - O Folan.

O Fallon or O Falloon - Irish / Ua Fallamhain. A Heremonian Ui Cobhthaigh Dal Cuinn Ui Maine Sept / Family branch of the Clann Udach Tuath / Family region, who had their territory near Athlone in Co. Roscommon in the east of the Connacht Province and were also nearby in Co. Offaly in the north - west of Southern Leinster. O Falloon used in Co. Armagh and Co. Down in the south - east of the Ulster Province. See also - Fullan and Folan. Ancestors - *86.Maine "Mor"(Ui Maine), *85.Murray / Muiredach "Tireach" the 12nd King of Tara / Ireland, *80.Conn of the Hundred Battles the 110th King of Tara / Ireland. 

Falls. Used by the Irish Sept / Family branch of Mheic Phail to anglicize their name.

Falls. English locative name. They were in Co. Tyrone in Central Ulster since the Mid - 17th Century AD after the Confiscation of the 3,400, 000 acres of the Heremonian Ui Cobhthaigh Dal Cuinn "Northern" Ui Niaill territories there and the Foreign non - Catholic Plantations there.

O Falsy or O Falahee - Irish / Ua Faolchaidh - faol / wolf. A Sept / Family branch, who had their territory in Co. Clare in the north - west of Thomond / Tuaiscert Mhumhain / Northern Munster.

O Falon - Irish / Ua Fallamhain. A Sept / Family branch, who had their territory in Co. Meath in the south - east of Northern Leinster where they were from the Crich na Cetach Sept.

O Falvey - Irish / Ua Failbhe - failbheach / lively. A Heremonian Ui Cobhthaigh Ui Conaire Muscraige Corca Duibhne Clann na Deaga Sept / Family branch, who had their territory in Co. Kerry in Iar Mhumhain / Western Munster where they were Kings. They were kinsmen to the O Connells of Co. Kerry and the O Sheas the Chiefs of Muskerry in Co. Cork in Desmond / Des Mhumhain / Southern Munster. Along with several other Chiefs they were descended from the Clan na Deaga who were Heremonian Chiefs in the Munster Province originally from Northern Leinster. *69.Conaire 11 the Heremonian Ui Cobhthaigh 111th King of Tara / Ireland was from the Clan na Deaga who was married to *81.Saraid / noble, one of the daughters of his predecessor, 80.Conn of the Hundred Battles the Heremonian Ui Cobhthaigh 110th King of Tara / Ireland in the 2nd Century AD who is the direct ancestor of all the Dal Cuinn Septs. The Heremonian Muscraige are the ancestors of the People of Muskerry and the Heremonian Ui Cobhthaigh Muscraige Kings of the Highlands of Scotland. One of their 3 sons, 70.Eochy / Cairbre "Riada" / riata is the actual ancestor of the Dal Riada (People of 70.Riada) in the the north - east of the Ulster Province and Argyle (The Land of the Gael) in the Scottish Highlands and Gaelic Milesian Kings of Scotland. *69.Conaire's 3 sons who are the direct ancestors of the Muscraige Septs, originally had large territories in the south of Munster Province, which originally took in Co. Cork and Co. Kerry. They were also in Co. Clare in the north - west of Thomond / Tuaiscert Mhumhain / Northern Munster. Ancestors - *69.Conaire 11 the 111th King of Tara / Ireland (Ui Conaire), *60.Coffey / Cobhthach the 69th King of Tara / Ireland.

Famod -                                                                                            +On to Fanagan - O Farren