Wikipedia
Grennan
Grennan is an Irish surname. It may be of Norman origin, from the French name Grenan. Notable people with the surname include:
- David Grennan (born 1971), Irish amateur astronomer
- Eamon Grennan (born 1941), Irish poet
- Justin Grennan (born 1978), American singer
- Keith Grennan (born 1984), American football player
- Winston Grennan (1944–2000), Jamaican drummer