Grennan is an Irish surname. It may be of Norman origin, from the French name Grenan. Notable people with the surname include:

• Eamon Grennan (born 1941), Irish poet
• James Grennan, Irish Gaelic footballer who played for Offaly
• Justin Grennan (born 1978), American singer
• Keith Grennan (born 1984), American football player
• Mike Grennan (1950–2009), American curler
• Seán Grennan, Irish dual player of Gaelic football and hurling who played for Offaly
• Tom Grennan (born 1995), English singer and songwriter
• Winston Grennan (1944–2000), Jamaican drummer
• Jacqueline Grennan Wexler (1926–2012), American academic administrator

See also

• Greenan (surname)
• Julia Grenan (1884–1972), Irish nationalist and socialist in the Easter Rising
• Grennan (disambiguation)

Surname list

This page lists people with the surname Grennan.
If an internal link intending to refer to a specific person led you to this page, you may wish to change that link by adding the person's given name(s) to the link.