Farrington / English toponymic origins / They were in Ireland in the 14th Century / Others came more recently.

Farris / Irish - Ui Fearaigh / A Sept - Family branch who had their territory in Co. Donegal - North West Ulster.

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

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

O Farry / Irish - Ui Farraigh / A Sept - Family branch who had their territory in Northern Connacht / Also used as a synonym for Fairy, which see.

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

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

O Faughnan / Irish - Ui Fachtnain / A Sept - Family branch who had their territory in Co. Leitrim - Northern Connacht & Co. Longford - North West Leinster.

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

Faulkner or Faulkney / See Falkiner & Faughnan.

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

Fawl or Faul / Used to abbreviate Mulfaul & Mac Faul, which see, in Co. Clare - North West Munster.

Fay / de Fae / Anglo Norman origins / They were in Co. Westmeath - North West Leinster near the end of the 12th Century / They were also in Co. Cavan & Co. Monaghan - Southern Ulster / Used also as a synonym for Fahy & Fee, which see.

Fealty / Unknown origins as yet / They were in Co. Donegal - North West Ulster.

Fealy / Used as a synonym for Falvey, which see, in Co. Kerry - South West Munster and for Fehilly, which see / Also confused with Feeley / See also Feley.

Fearnain / Fhearnain / A Sept - Family branch who had their territory in Co. Down - South East Ulster.

O Fearon / Irish - Ui Fearain - fear - man / A Heremonian Dal Cuinn "Northern" Ui Niaill Cenel nEogain Sept who had their territory in Co. Armagh - South East Ulster in the 3 Colla kingdom of Airgialla - Oriel / Feran & Feron are used as variants / See also Farren. *88.Eogain.

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

O Fedegan / Irish - Ui Feadagain / A Sept - Family branch who had their territory in the 3 Colla kingdom of Airgialla - Oriel Co. Monaghan - Southern Ulster near Clones / They have been in the Barony of Ardee in Co. Louth - North East Leinster since the 15th Century.

Mac Fee / See Mahaffy.

O Fee or Fey or Foy or Fye / Irish - Ui Fiaich / Changed also to Fay or Hunt / fiach – raven / fiadhach – hunt / Known as Fee in Co. Armagh, Co. Cavan & Co. Fermanagh - Southern Ulster / Foy used in Co. Cavan & Northern Connacht.

O Feehan / Irish - Ui Fiachain - fiach - raven / A Sept – Family branch who had their territory in Co. Tipperary - Northern Munster & Co. Kilkenny - Western Leinster / May be the same as Feehin? / Confused also with O Fegan / Irish - Ui Faodhagain in Co. Louth - North East Leinster, which see.

+On to  Feeharry - Feley                                               *Irish Heritage