Hennessy (surname)
Hennessy is an Irish surname, being the anglicised form of Ó hAonghusa.
Notable people with the surname include:
- Ryan Hennessy, Australian pioneer rugby league identity
- Bill Hennessy, former Irish sportsman
- Carly Smithson, Irish singer
- Claire Hennessy, Irish novelist
- Clinton Hennessy, Irish sportsperson
- David Hennessy, police chief of New Orleans
- George Hennessy, 1st Baron Windlesham, British soldier and Conservative politician
- Jean Hennessy, French politician and member of the Hennessy family
- Jacqueline Hennessy, journalist
- Jill Hennessy, film and television actress
- Joe Hennessy, former Irish sportsperson
- Archbishop John Hennessy, former head of the Roman Catholic Archdiocese of Dubuque
- John L. Hennessy, American computer scientist and current president of Stanford University
- John Pope Hennessy, eighth governor of Hong Kong
- Josh Hennessy, professional ice hockey player
- Kevin Hennessy, Irish retired sportsperson
- Larry Hennessy, American basketball player
- Matt Hennessy, American football player
- Matthew Hennessy, Irish computer scientist
- Miranda Hennessy, British actress and comedian
- Neil Hennessy, musician and music producer/engineer
- Patrick Hennessy, several people including
- *Patrick Hennessy,, an Irish artist
- * Sir Patrick Hennessy,, an Irish-born British industrialist,
- Peter Hennessy, English historian of government
- Séamus Hennessy, Irish sportsperson
- Swan Hennessy, Irish-American composer resident in Paris
- Thomas Hennessy, Irish politician
- Thomas Hennessy , American football player
- W. Louis Hennessy, 4th Circuit Court Associate Judge in Maryland, former Maryland Delegate
- William John Hennessy, Irish painter
