O Fodaghan or Swift - Irish / Ua Fuadachain. Cognate with Foody,with both later anglicized as Swift, which see. A Sept / Family branch, who had their territory in Co. Cavan and Co. Monaghan in Southern Ulster.

Fodha / fada (long). Synonymous with Long, which see.

O Fogarty of Co. Tipperary - Irish / Ua Fhogartaigh (fogartach / expelling.) Heremonian Dal Cuinn "southern" Ui Niaill Siol nAedo Slaine Sept / Family branch who had their territory and were Kings in the Barony of Eliogarty in Co. Tipperary in the north - east of Aur Mhumhain / Ormond / Eastern Munster. Ancestors: *90.Niall of the Nine Hostages the 126th King of Ireland (Ui Niaill) the father of 91.Conalll Crimthann the first Christian King of Meath in Northern Leinster and a brother to *91.Laoghaire ancestor of the O Connellans and the 128th King of Ireland, and the father of 92.Fergus Cearbhall the father of *93.Diarmaid / Dermod mac Carroll the 5th King of Meath and 133rd King of Ireland who was killed at the Battle of Rath Beg by Aodh mac Sweeney the King of the Dal Araidhe in 558 AD. 93.Diarmaid's elder brother, 93.Main had been the 4th King of Meath, 93.Diarmaid's younger son, *94.Aodh Slaine was the 141st King of Ireland who had an older half - brother 94.Colman Mor the 6th King of Meath the ancestor of the Clann Cholmain, *94.Aodh Slaine was the father of 95.Dermod Ruanach, who had a brother 95.Congal the ancestor of the O Kellys of Meath who were one of the 4 Septs of Tara and another brother, *95.Donough the ancestor of the O Mulveys who was the 149th King of Ireland jointly with his brother *95.Bladhmhac who both died in 664 AD, 95.Dermod Ruanach was the father of 96.Cearnasotal the father of 97.Niall the father of *98.Foghartach the 157th King of Ireland who had 3 brothers, 98.Cumascach who is the ancestor of the Burns, 98.Conall Greanta who is the ancestor of the Breslins, 98.Aodh Laighen who is the ancestor of the Muldoons of Meath, His son, 99.Kelly / Ceallach was the father of 100.Tolarg the direct male line ancestor of the O Tolers / Tylers / Ui Tolairg, and the father of 101.Foghartach the father of 102.Niall the father of 103.Foghartach the direct male line ancestor of the O Fogartys / Ui Foghartaigh. 

O Fogarty of Ulster. Heremonian Dal Cuinn Colla Da Crioch Sept / Family branch. Ancestors: *86.Cairbre Liffeachair the 117th King of Tara / Ireland.  87.Eochy / Echu Doimhlen, 88.Murray / Muireadach Colla Da Crioch - Champion of the Two Countries,

O Fogarty. Irish / Ua Fhogartaigh. Heberian Dal gCais Eliogarty Sept / Family branch ? who had their territory in Co. Tipperary in Northern Munster.  

Mac Foland or Mac Fallon or Mac Folan or Mac Folane - Irish / Mheic Fualain. Gaelic Milesian Irian Conmaicne Mara Brehon Sept / Family branch, who had their territory in the Connemara in the west of Co. Galway in the Connacht Province who were kinsmen to the O Kealys / O Queally, O Devany / Ui Dubhain.  Ancestors: 79.Conmacc (Conmaicne), 78.Oirbsen Mor / Orsenmar after whom Loch Oirbsen is named, 64.Fergus mac Roich, 63.Ros Ruadh, the King of Ulster, *62.Rory Mor the 86th King of Tara / Erinn (Clann na Rory), 37.Ir (Irians). Mac Folan was used close by in Co. Mayo in the mid - west of Connacht. Especially see O Folan.

Folan. Used as a synonym for Fallon, which see, in the Connacht Province in O Fallon’s Country.

O Foley - Irish / Ua Foghladha - foghlaidh (marauder or plunderer). A Sept / Family branch, who were numerous in Southern Munster, where they had their original territory in Co. Waterford in the south - east of the Munster Province and were also in Co. Kerry in Iar Mhumhain / Western Munster. Also see next entry regarding Mac Sharry.

Foley. Used also as a synonym for Mac Sharry - Irish / Mac Searraigh, which see.

Folliot - follet (gay). French English origins in Co. Dublin in the north - east of Southern Leinster and Clonmel in Co. Tipperary in the north - east of Ormond / North Eastern Munster in 1409 AD. Some also came later with the confiscation of the 3,500,000 acres of the Heremonian Ui Cobhthaigh Ui Felim Dal Cuinn  "northern" Ui Niaill territories in the Ulster Province and the foreign non - Catholic plantations there, and were also in Co. Donegal in the north - west of Ulster.

O Foody or O Foudy - Irish / Ua Fuadaigh - fudach (plundering). A Sept / Family branch, who had their territory in Co. Mayo in the mid - west of the Connacht Province. Also changed to Swift and Speed, which see.

O Foran - Irish / Ua Furain. A Sept / Family branch, who had their territory in Co. Limerick and Co. Waterford in the Munster Province. Also changed to Ford.

Forbes. Used to anglicize Mac Firbis, which see. Pronounced Forbis in Co. Clare in the north - west of Thomond / Northern Munster.

Forbes. Scottish origins in Co. Longford in the north - west of Northern Leinster where they were the English Earls of Granard.

Ford or Forde - Irish / Mheic Ghiolla na Naomh (Descended from a son of the follower of the Saints.) A Sept / Family branch, who had their territory in Southern Connacht.

Ford - Irish / Mheic Giolla Arnath. A Sept / Family branch, who had their territory in the south of the Connemara in Co. Galway in Southern Connacht.

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