The surname Troy is anglicised from the following surnames:

• The Gaelic-Irish surnames
  • Ó Tréamháin (Meaning unknown - possibly descendant of journals)
  • Ó Troighthigh (Descendant of foot-soldier)
  • Ó Toráin (Meaning unknown - possibly descendant of turrets)
• The Anglo-Norman (or French) toponymic surname
  • de Troyes (from Troyes, France^[1])
  • de Troye (from Mitchell Troy, Wales^[2][3])

People

Arts and entertainment

• Dermot Troy (1927–1962), Irish singer
• Doris Troy (1937–2004), American R&B singer
• Hagen Troy, Singaporean-born composing artist
• Hugh Troy (1906–1964), American painter
• John Troy (hurler) (born 1971), Offaly GAA hurler and all-star
• Judy Troy (born 1951), American university professor, short story writer and novelist
• Leroy Troy (born 1966), American banjo player
• Louise Troy (1933–1994), American stage and screen actress
• Pastor Troy (Micah LeVar Troy, born 1977), American rapper, actor, and record producer
• William Troy (educator) (1903–1961), American essayist, teacher and film critic

History and current affairs

• William Troy (Medal of Honor) (1848–1907), US Navy sailor awarded the Medal of Honor

Politics and law

• Dan Troy (born 1948), Ohio, United States, politician
• John Troy (Australian politician) (born 1941), doctor and member of the Western Australian Legislative Assembly, 1977–1980
• John Weir Troy (1868–1942), American Democratic politician, Governor of Alaska Territory, 1933–1939
• Leo Troy, Canadian politician
• Frank Troy (1877–1953), Australian politician
• Paddy Troy (1908–1978), Australian trade unionist and communist activist
• Robert Troy, Irish politician
• Tevi Troy (born 1967), official in administration of U.S. President George W. Bush, adviser to presidential candidate Mitt Romney

Religion

• Bertie Troy (1931–2007), Roman Catholic priest and All-Ireland Hurling Final winning manager
• E. F. Troy (c. 1855 – 1910), Catholic philanthropist and stained glass artist in Australia
• John Troy (bishop) (1739–1823), Roman Catholic Archbishop of Dublin

Science and academics

• Elizabeth Mary Troy (1914–2011), Irish obstetrician

Sports

• "Bun" Troy (1888–1918), German-American major league baseball pitcher
• "Dasher" Troy (1856–1938), American major league baseball player
• Gregg Troy (born 1950), American college and Olympic swimming coach
• Jack Troy (1927–1995), Australian rugby league footballer
• Jim Troy (hurling) (born 1960), retired Irish hurling player
• Jim Troy (ice hockey) (born 1953), American former professional ice hockey player
• Mike Troy (1940–2019), American swimmer

People with non-anglicised versions

de Troyes

• Chrétien de Troyes (1160–1191), French poet and trouvère known for his writing on Arthurian subjects
• Richard de Troye (fl. 1247–1262), was a Norman Knight and landowner in County Kilkenny, Ireland.
• Theobald de Troye (fl. 1317), was a Norman Knight and landowner in County Kilkenny, Ireland. Quite likely a descendant of Richard De Troye as they held the same land and paid knights fees in County Kilkenny.
• Guillaume de Troyes (fl. 1357), was a royal falconer during the reign of King Edward III.
• John de Troye (died 1371), a Welsh-born Crown official and judge in fourteenth century Ireland, who held the offices of Chancellor of the Exchequer of Ireland and Lord Treasurer of Ireland.
• François de Troy (1645–1730), French painter and engraver
• Jean François de Troy (1679–1752), French painter and tapestry designer
• Edward Troye (1808–1874), Swiss-born American painter
• Pierre de Troyes (died 1868), a captain that led the French capture of Moose Factory, Rupert House, and Fort Albany in Hudson Bay 1686.
• Olivia Troye (born 1977), American former government official and vice president of strategy, policy, and plans at the National Insurance Crime Bureau
• Raymond Troye (1908–2003), Belgian officer and writer

Ó Troighthigh

• Aicher Ua Traighthech (died 1002/1003), soldier of Corcomroe in the medieval period and mentioned in the Irish Annals.
• Domhnall Albanach Ó Troighthigh (fl. 1482), was an Irish scribe and physician.

Fictional characters

• Christian Troy, a fictional character played by Julian McMahon on the FX Networks series Nip/Tuck.
• Donna Troy, fictional superheroine appearing in DC Comics
• Lillian Troy, a fictional character appearing in the play "I Hate Hamlet" by Paul Rudnick.

Place Names originating from the Troy (or variant) surname

• Ballytrehy / Baile Uí Throithigh (The town of Ó Troithigh), a region in Clogheen, County Tipperary, Ireland.
• Ballynatray / Baile Uí Throithigh (The town of Ó Troithigh), a region in Coshbride, County Waterford, Ireland.
• Castletroy / Caladh an Treoigh (O' Troy's Landing), a suburb of Limerick, County Limerick, Ireland.
• Troy's Gate / Geata an Treoigh (Gate of O' Troy's), an historical gate within the town of Kilkenny, County Kilkenny, Ireland.
• Troyes, a commune and the capital of the department of Aube in the Grand Est region of north-central France.
• Troyswood / Coill an Treoigh (Wood of O' Troy's), a region of County Kilkenny, Ireland.
• Troyswood Castle, a castle ruins in Troyswood, County Kilkenny, Ireland.
• Mitchell Troy / Llanfihangel Troddi (Church of St Michael on the River Trothy) a village and community in Monouthshire, south east Wales.