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 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) 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 Kyle Costigan, American Football Player, Strength and Conditioning Coach for the University of Wisconsin-Madison 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 (entrepreneur) Michael Costigan (film producer) Michael Costigan (youth speaker) 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 Conway Costigan, a character in E.E. Smith's Triplanetary Jerry, Grace and Russell Costigan, characters in Robert B. Parker's novel "A Catskill Eagle" Catta Costigan "stampatore in Florence" See also Costigan, New Brunswick, Canada Costigan Commission, the Royal Commission on the Activities of the Federated Ship Painters and Dockers Union Mount Costigan, a summit in Alberta, Canada References