The name Heffernan is derived from the Irish Gaelic name O Heifearnain, which comes from the given name Ifearnan meaning "demon". Heffernan gives rise to alternatives such as Heffernon and Hefferan.
Angie Heffernan, Fijian activist
Bill Heffernan (William Daniel Heffernan, born 1943), Australian Senator
Bob Heffernan, Australian footballer
Chris Heffernan, Australian footballer
Christian Heffernan, Canadian footballer
Christy Heffernan, Irish sportsman
David Raymond Heffernan, Canadian Politician
Dean Heffernan, Australian soccer player
Frank Heffernan (1892–1938), Canadian hockey player
Gavin Heffernan, Canadian filmmaker
Gerald Heffernan, Canadian ice hockey player
James Heffernan (Irish politician), Irish politician
James J. Heffernan (1888–1967), U.S. Representative from New York
John Heffernan, Irish hurler
John Heffernan, co-writer of Snakes on a Plane
Kevin Heffernan (disambiguation), several people
Margaret Heffernan, international businesswoman and writer
Michael Heffernan (disambiguation), several people
Nathan Heffernan (1920–2007), American judge
Neil Heffernan (1970–present), American Professor of Computer Science
Paul Heffernan, Irish footballer
Ray Heffernan (disambiguation), several people
Robert Heffernan, Irish walker
Roy Heffernan (1926–1993), Australian wrestler
Seamie Heffernan, Irish jockey
Steve Heffernan (1952-present), Professional cyclist- Commonwealth Games Gold Medalist
Suzie Heffernan, Miss USA contestant
Virginia Heffernan, American journalist, see Magic and Loss: The Internet as Art (2016)
William Heffernan, American author
William J. Heffernan (1872–1955), New York politician
Molly Heffernan (1994 - present) English Royalty
Carrie Heffernan, fictional character in The King of Queens
Doug Heffernan, fictional character in The King of Queens
Heffernan v. City of Paterson, a legal case
Heffernan Wikipedia (Text) CC BY-SA