Grogan is a surname. Originally from county Roscommon, Connaught in Ireland. The Irish version is, O'Grugain.
Notable people with the surname include:
Benjamin Grogan, FBI agent killed in the 1986 FBI Miami shootoutClare Grogan (born 1962), Scottish actress and singerClem Grogan (born 1951), actual name Steve Dennis Grogan, an American murderer and former member of the Manson FamilyCornelius Grogan (1738?–1798), a member of the Society of United IrishmenDavid Grogan (1914–1993), British water polo playerEmmett Grogan (1943–1978), founder of the hippie group the DiggersEwart Grogan (1874–1967), British explorer of Africa, prominent Kenyan businessmanGeorge Grogan (1875–1962), recipient of the Victoria CrossJames Grogan (1931–2000), American figure skaterJohn Grogan (UK politician), British politicianJohn Grogan (journalist) (born 1957), American journalistKevin Grogan (born 1981), Irish football playerLiz Grogan, Canadian television hostNathaniel Grogan (1740–1807), Irish illustratorSteve Grogan (born 1953), American football player