The family name Reagan, and its cognates Regan, O'Regan, O Regan, O'Reagan, is an Anglicized form of the Irish surname Ó Riagáin or Ó Ríogáin, from Ua Riagáin. The meaning is likely to originate in ancient gaelic from ri "sovereign, king" and the diminutive -in, "the king's child", transliterating as "little king".
The feminine unisex forename, Regan, is likely to have derived sometime later from the English royal name Regina.
Notable people with the surname include:
Ronald Reagan (1911–2004), 40th President of the United StatesNancy Reagan (1921–2016), wife of Ronald Reagan and First Lady from 1981 to 1989Maureen Reagan (1941–2001), President Reagan's daughter from his first marriage to Jane WymanMichael Reagan (born 1945), President Reagan's adopted son and radio talk show hostPatricia Ann Reagan (born 1952), better known as Patti Davis, Ronald and Nancy Reagan's daughterRon Reagan (born 1958), President Reagan's son and journalistFrank Reagan (1919–1972), American football playerJohn Henninger Reagan (1818–1905), American politicianJohnny Reagan (born 1926), American college baseball coachLisa Reagan, American singerMarc Reagan, NASA Station Training Lead and NEEMO underwater program Mission DirectorMichael Joseph Reagan (born 1954), American judgeRon Reagan (Florida representative) (born 1954), American politician