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.
People with the surname Heffernan include:
- Angie Heffernan, Fijian activist
- Bill Heffernan, Australian Senator
- Bob Heffernan, Australian footballer
- Carrie Heffernan, fictional character in The King of Queens
- Chris Heffernan, Australian footballer
- Christian Heffernan, Canadian footballer
- Christy Heffernan, Irish sportsman
- Dean Heffernan, Australian soccer player
- Doug Heffernan, fictional character in The King of Queens
- Frank Heffernan (1892–1938), Canadian hockey player
- Gavin Heffernan, Canadian filmmaker
- Gerald Heffernan, Canadian ice hockey player
- James Heffernan, Irish politician
- James J. Heffernan (1888–1967), U.S. Representative from New York
- John Heffernan, Screenwriter of Snakes on a Plane
- Kalyn Heffernan, Hip hop artist and producer.
- Kevin Heffernan (Gaelic footballer)
- Kevin Heffernan (comedian)
- Michael Heffernan (politician) (1885–1970), Irish politician
- Nathan Heffernan (1920–2007), American judge
- Paul Heffernan, Irish footballer
- Robert Heffernan, Irish walker
- Roy Heffernan (1926–1993), Australian wrestler
- Seamie Heffernan, an Irish jockey
- Suzie Heffernan, Miss USA contestant
- Virginia Heffernan, American journalist and New York Times columnist
- William Heffernan, American author
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