Farrington. English toponymic origins. They were initially in Ireland in the 14th Century AD while others came more recently.

Farris - Irish / Ua Fearaigh. A Sept / Family branch, who had their territory in Co. Donegal in the north - west of the Ulster Province.

Farris. Used as a synonym for Fergus, which see, in the Connacht Province and surrounding regions and especially in Co. Cavan in Southern Ulster and nearby in Co. Leitrim in Northern Connacht. Also see Ferris, Fairy and Paris.

O Farrissy - Irish / Ua Fearghusa - fear / man / gus - action. An important Sept / Family branch, who had their territory in Co. Mayo and Co. Leitrim in the Connacht Province. Also used in the Munster Province as a variant for Fergus. Ferris also used.

O Farry - Irish / Ua Farraigh. A Sept / Family branch, who had their territory in the north of the Connacht Province. Also used as a synonym for Fairy, which see.

Farshin - fairsing / generous. A variant used by some of the Heberian Eoghanacht Chaisil *Mac Carthys, which see, in Co. Cork in Desmond / Des Mhumhain /  Southern Munster.

Farty. Used as an abbreviation for Faherty, which see.

O Faughnan - Irish / Ua Fachtnain. A Sept - Family branch, who had their territory in Co. Leitrim in Northern Connacht and nearby in Co. Longford in the north - west of Northern Leinster.

O Faughney - Irish / Ua Fachtna. A Sept / Family branch, who had their territory in Co. Leitrim in Northern Connacht. May be the same as the previous entry. Now known as Faulkney and Faulkner.

Fawcett or Fossitt. English toponymic origins. They were in Ireland in the late 16th Century AD.

Fay or Faye / de Fae. Anglo Norman origins. They were in Co. Westmeath in the south - west of Northern Leinster near the end of the 12th Century AD and were also nearby in in Co. Cavan and Co. Monaghan in Southern Ulster. Used also as a synonym for Fahy and Fee, which see.

Fealty. Unknown origins as yet. They were in Co. Donegal in the north - west of the Ulster Province.

O Fearon - Irish / Ua Fearain - fear / man. A Heremonian Ui Cobhthaigh Dal Cuinn "Northern" Ui Niaill Cenel nEogain Sept / Family branch, who had their territory in Co. Armagh in the south - east of the Ulster Province in the 3 Colla kingdom of Orghialla / Airghialla / Oriel. O Feran and O Feron were used as variants. See also O Farren. Ancestors - *88.Eogan the 1st King of Aileach (Cenel nEogain), *87.Niall of the Nine Hostages the 126th King of Tara / Ireland (Ui Niaill).

O Feary. A Heremonian Ui Laoghaire Ui Lughaidh Cu Corb Sept / Family branch. Ancestors - *78. Lewy / Lughaidh (Ui Lughaidh), *86,Cu "Corb," *60.Leary / Laoghaire the 68th King of Tara / Erinn (Ui Laoghaire),

Feddis or Fiddes. May be of Norman origins / de Sancto Fide. They were in Co. Fermanagh in the south - west of the Ulster Province. May be also the origin of the names Sanfey and Sanphy in the south of the Leinster Province?

O Feddigan. A Heremonian Ui Cobhthaigh Dal Cuinn Colla da Crioch Cenel Rochada Fernmag / Fer Fermaighe / Farney Sept / Family branch, who had their territory in the Heremonian Ui Cobhthaigh Dal Cuinn 3 Colla 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 Fedegan or  O Faddigan or O Feddigan / Ui Feadagain - Irish / Ua Feadagain. A Heremonian Ui Cobhthaigh Dal Cuinn Colla da Crioch Cenel Rochada Fernmag / Fer Fermaighe / Farney Sept / Family branch, who had their territory in their 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. Ancestors - *107.Lethlobar, *106.Fogartach, *105.Murray / Muiredach, *104.Laidgnen, *103.Fogartach, *102.Duncan / Donncuan, *101.Fogartach, *100.Ruadrach, *99.Maoilfothartaigh, *98.Artrach, *97.Aitheachda, *96.Mailduib, *95.Maoilfothartaigh, *94.Cronan, *93.Fergus, *92.Nadsluaig, *91.Cairpre "Daim Argait," *90.Eochy / Echach, *89.Criffan / Crimthainn "Leith" / "Lethan," *88.Feicc, *87.Dega "Duirn," *86.Rochad / Rochatha, *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 Fee or O Fey or O Foy or O Fye - Irish / Ua Fiaich. Also changed to O Fay or Hunt / fiach - raven / fiadhach - hunt. Known as O Fee in Co. Armagh, Co. Cavan and Co. Fermanagh in Southern Ulster. Foy used in Co. Cavan and Northern Connacht.

O Feehan - Irish / Ua Fiachain - fiach / raven. A Sept / Family branch, who had their territory in the Heberian Dal gCais Ui Turlough O Kennedy kingdom in  in Co. Tipperary in Ormond / Aur Mhumhain / North Eastern Munster and nearby in Co. Kilkenny in the south - west of Southern Leinster. May be the same as O Feehin? Confused also with O Fegan - Irish / Ua Faodhagain in Co. Louth in the north - east of Northern Leinster, which see.

                                                                                       +On to Feeharry - Feley