Gahagan
Gahagan is a surname of which is derived from Geoghegan. Notable people with the surname include:
- Dennis Gahagan, early settler in San Diego, California
- Helen Gahagan Douglas, American actress and politician
- James Gahagan, American painter
- John Gahagan, Scottish footballer
- Lawrence Gahagan, Irish-born sculptor
- Sebastian Gahagan, Irish-born sculptor