The surname Farrelly is of Irish origin, deriving from the Gaelic patronymic Ó Fearghaile, which signifies a descendant of the personal name Fearghal. This personal name is composed of the elements fear, meaning “man”, and gal, meaning “valor” or “bravery”. Consequently, the full name can be interpreted as “man of valor” or “descendant of the valorous man”.

Historically, the Farrelly family was associated with the Gailenga tribal group and originally occupied territories in County Cavan and County Longford. During the Middle Ages, as governmental and legal record‑keeping required fixed surnames, the name Ó Fearghaile was adopted by various branches of this clan, reflecting both lineage and personal distinction.

Over the centuries the spelling of the surname has evolved, partly because early Irish writers recorded names phonetically and because the English language lacked a standard orthography for Irish names. Common variants include Farelly, Farley, Farly, Farely, Falan, O’Farrelly, and many others. In some immigration records, clerks wrote the name according to how it sounded to them, producing further discrepancies such as Farrel or Fearely.

Despite its variations, the surname remains most frequently found in its ancestral domains of County Cavan and County Longford. Nonetheless, the considerable Irish diaspora has disseminated the name throughout the English‑speaking world, establishing notable families in the United States, Australia, Canada and the United Kingdom. In all these contexts the surname retains its original meaning and a sense of proud heritage.

Because multiple families chose the surname independently—often in admiration of a respected local figure or owing to a shared clan affiliation—present-day bearers of the name Farrelly may not share a single common ancestor. Nevertheless, the name continues to evoke the qualities of courage and honour that its Gaelic roots originally conveyed.

Typical given names associated with the Farrelly surname

Male

  • David
  • Ian
  • James
  • John
  • Martin
  • Michael
  • Patrick
  • Paul
  • Peter
  • Stephen
  • Thomas

Female

  • Anne
  • Clare
  • Elizabeth
  • Emma
  • Jean
  • Joanne
  • Laura
  • Lisa
  • Margaret
  • Mary
  • Michelle
  • Patricia
  • Sarah
  • Susan

Similar and related surnames

Related and similar names are generated algorithmically based on the spelling, and may not necessarily share an etymology.

How to communicate the surname Farrelly in...

Braille

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There are approximately 2,689 people named Farrelly in the UK. That makes it roughly the 3,317th most common surname in Britain. Around 41 in a million people in Britain are named Farrelly.

Origin: Celtic

Region of origin: British Isles

Country of origin: Ireland

Religion of origin: Christian

Language of origin: Gaelic

The Genealogist - UK census, BMDs and more online

Famous people named Farrelly

  • Stephen Farrelly - Irish professional wrestler and actor
  • Paul Farrelly - Politician

Names and descriptions courtesy of Wikipedia, and may contain errors. This is not intended to be an exhaustive list of every famous person with this name.

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