Leahy is an Irish surname, originating in Munster, and now found in counties Cork, Kerry, Limerick, and Tipperary.

It is usually an anglicised form of the Irish language surname Ó Laochdha ("descendant of Laochdha"),^[1]: 191 which ultimately derives from Old Irish láechda, láech ("warrior-like, pertaining to a warrior") and appears as a personal sobriquet at least as early as the Book of Lismore (circa 1408–11).^[2] However, Leahy may also represent an anglicisation of less common names, including Mac Fhlaithimh and Ó Flaithimh, Mac an Leagha, Ó Leathaigh, Ó Liathaigh, Ó Líthe, Ó Laidhe, Ó Laidhigh, Ó Laithimh, Ó'Lathaigh, Ó Laithmhe, Ó Laochdha, Ó Laoi, Ó Laoidhigh, or Ó Laoithe.^[3]

Not to be confused with Lahey which means "Ruler" and is a separate family lineage. Other anglicised forms of the name include Leahey, Lahy, Leehy, Leehey, Lahaie, Lahaye, Lehait,^{[4]: 15 [1]: 188 [5]: 104–106} Claffey, Laffey, and Lee.^[3]

• Ann Leahy (born 1971), Australian politician
• Bernie Leahy (1908-1978), American footballer.
• Con Leahy (1880–1921), Irish athlete
• Edward Daniel Leahy (1797–1875), Irish painter
• Edward L. Leahy (1886–1953), United States Senator
• Emmett Leahy (1910–1964), American archivist and entrepreneur
• Frank Lahey (1880–1953), surgeon, medical educator, and founder of Boston's Lahey Clinic
• Frank Leahy (1908–1973), American football player and coach, athletics administrator and sports executive
• Georgie Leahy (1938–2017), Irish hurling manager, coach, selector and player
• Grainne Leahy (born 1966), Irish cricketer
• Sir John Leahy (diplomat) (1928–2015), British diplomat
• John Leahy (executive) (born 1950), American businessman, executive at Airbus
• John Leahy (born 1969), former Irish hurler
• John O'Lahy (executed 5 Jul 1581), sailor, and one of the Wexford Martyrs
• Kevin Leahy (disambiguation)
• Kristine Leahy (born 1986), American television host and former sports reporter
• Luke Leahy (born 1992), English footballer
• Margaret Leahy (1902–1967), British actress
• Michael Leahy (disambiguation)
• Patrick Leahy (disambiguation)
• Peter Leahy (born 1952), Chief of the Australian Army
• Sean Leahy (born 1958), Australian cartoonist
• Sir Terry Leahy (born 1956), English businessman
• Tom Leahy (1888–1964), Australian rules footballer
• William D. Leahy (1875–1959), American naval officer and ambassador
• William Harrington Leahy (1904–1986), United States Navy admiral
• William P. Leahy (born 1948), President of Boston College

This page lists people with the surname Leahy.
If an internal link intending to refer to a specific person led you to this page, you may wish to change that link by adding the person's given name(s) to the link.

• Leahy (disambiguation)