Gahagan

Gahagan is a surname of which is derived from Geoghegan. Notable people with the surname include:


 * Dennis Gahagan (c. 1817–?), early settler in San Diego, California
 * Helen Gahagan Douglas (1900–1980), American actress and politician
 * James Gahagan (1927–1999), American painter
 * John Gahagan (born 1958), Scottish footballer
 * Lawrence Gahagan (d.1820), Irish-born sculptor
 * Sebastian Gahagan (1779–1838), Irish-born sculptor