Costigan () is an Irish surname with higher concentrations in counties Laois, Tipperary and Kilkenny. Costigan is a branch of the Fitzpatricks (Mac Giolla Phádraig dynasty) of Upper Ossory, although the name may also independently derive from Hodgkin, a dimin. of Roger. Genetic evidence shows shared ancestry amongst Fitzpatricks and Costigans with ancestry in Upper Ossory Notable people with the surname include:
Christopher Costigan, explorer of the Jordan River and Dead Sea in 1835 Daniel Costigan (1911–1979), Commissioner of the Garda Síochána from 1952 to 1965 Deirdre Costigan, British politician Edward P. Costigan (1874–1939), US senator from Colorado Francis Costigan, early Indiana architect Frank Costigan, (1931–2009) Australian QC and commissioner in the Royal Commission on the activities of the Federated Ship Painters and Dockers Union (known as the Costigan Commission) Gina Costigan (born 1984), Irish actress Giovanni Costigan (1905–1985), historian George Costigan (born 1947), a British television actor Howard Costigan (1904–1985), American political functionary James Costigan, screenwriter Jason Costigan, Australian Liberal National politician and former rugby commentator John Edward Costigan, American artist John Costigan (hurler) Keith Costigan, former soccer player, and television sports analyst Mabel Cory Costigan (1873–1951), on the advisory council of the National Child Labor Committee and vice president of the National Consumers League. Michael Costigan (film producer) Neville Costigan, Australian rugby league footballer Peter Costigan, (1935–2002), Australian journalist, former Lord Mayor of Melbourne Sandra Costigan, former field hockey player
Fictional characters: Billy Costigan, a character in the Martin Scorsese film, The Departed, played by Leonardo DiCaprio Captain Costigan, a character in the novel Pendennis, by William Makepeace Thackeray. Sailor Steve Costigan, a character created by Robert E. Howard, creator of Conan the Barbarian and father of the sword and sorcery genre. Conway Costigan, a character in E.E. Smith's Triplanetary ”Fast Eddie” Costigan, a character in Spider Robinson's Callahan’s Crosstime Saloon
See also Costigan Commission, the Royal Commission on the Activities of the Federated Ship Painters and Dockers Union Mount Costigan, a summit in Alberta, Canada
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