'''Costigan''' ({{langx|ga|Mac Oistigin}}) is an Irish surname with higher concentrations in counties Laois, Tipperary and Kilkenny.<ref>{{Cite web|url=http://www.irishorigenes.com/costigan|title = Costigan &#124; Irish Origenes: Use your DNA to rediscover your Irish origin}}</ref> Costigan is a branch of the Fitzpatricks (Mac Giolla Phádraig dynasty) of Upper Ossory,<ref>{{Cite web|url=https://www.fitzpatrickclan.org/The%20Mac%20Costigan%20of%20Ossory%20-%20dismantling%20an%20assumed%20genealogy.pdf|title = "The Mac Costigan of Ossory: dismantling an assumed genealogy"}}</ref> 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<ref>{{Cite web|url=https://www.johngrenham.com/findasurname.php?surname=Costigan|title = Irish genealogy records for the surname Costigan}}</ref><ref>{{Cite web|url=http://www.rootsweb.ancestry.com/~irlkik/ihm/irenames.htm|title=Ireland's History - Old Irish Gaelic Surnames}}</ref><ref>{{cite web | url=https://www.familytreedna.com/public/fitzpatrick?iframe=ycolorized | title=FamilyTreeDNA - Fitzpatrick }}</ref> 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<ref>{{Cite web |date=2 November 2023 |title=Gina Costigan: 'The Irish have a tendency towards darkness' |url=https://www.cambridgeindependent.co.uk/whats-on/gina-costigan-the-irish-have-a-tendency-towards-darkness-9337816/ |website=Cambridge Independent}}</ref> * 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.<ref>{{Cite journal |last=Dowd |first=Christopher |date=2016 |title=The Irish-American Identities of Robert E. Howard and Conan the Barbarian |url=https://www.jstor.org/stable/44807183 |journal=New Hibernia Review / Iris Éireannach Nua |volume=20 |issue=2 |pages=15–34 |jstor=44807183 |issn=1092-3977}}</ref> * 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

==References== {{Reflist}}

{{surname|Costigan}}