Hennessy (surname) explained
Hennessy (or Hennessey) is an Irish surname, being the anglicised form of Ó hAonghusa.
Notable people with the surname include:
- Arthur Hennessy (1876–1959), Australian pioneer rugby league identity
- Bill Hennessy (disambiguation)
- Carly Smithson (née Hennessy, born 1983), Irish singer
- Christie Hennessy (1945-2007), Irish singer
- Claire Hennessy (born 1986), Irish novelist
- Clinton Hennessy (born 1977), Irish sportsperson
- David Hennessy (1858–1890), police chief of New Orleans
- Esmé Frances Hennessy (born 1933), South African botanist
- George Hennessy, 1st Baron Windlesham (1877, 1953), British soldier and Conservative politician
- Jean Hennessy (1874–1944), French politician and member of the Hennessy family
- Jacqueline Hennessy (born 1968), journalist
- Jill Hennessy (born 1968), film and television actress
- Joe Hennessy (born 1956), former Irish sportsperson
- Archbishop John Hennessy (1825–1900), head of the Roman Catholic Archdiocese of Dubuque
- John L. Hennessy (born 1953), American computer scientist and current president of Stanford University
- John Pope Hennessy (1834–1891), Irish colonial administrator and politician - eighth governor of Hong Kong, fifteenth governor of Mauritius, MP for King's County
- Josh Hennessy (born 1985), professional ice hockey player
- Kevin Hennessy (born 1961), Irish retired sportsperson
- Larry Hennessy (1929–2008), American basketball player
- Matt Hennessy (born 1997), American football player
- Matthew Hennessy, Irish computer scientist
- Miranda Hennessy, British actress and comedian
- Neil Hennessy (born 1978), musician and music producer/engineer
- Patrick Hennessy, several people including
- Peter Hennessy (born 1947), English historian of government
- Ryan Hennessy (born 1995), Irish singer and musician
- Séamus Hennessy (hurler, born 1989), Irish sportsperson
- Swan Hennessy (1866–1929), Irish-American composer resident in Paris
- Thomas Hennessy (politician), Irish politician
- Thomas Hennessy (American football) (born 1994), American football player
- W. Louis Hennessy (born 1955), 4th Circuit Court Associate Judge in Maryland, former Maryland Delegate
- William Hennessy (disambiguation)
See also
