O’Riordan is a surname of Irish origin. According to historian C. Thomas Cairney, the O'Riordans were one of the chiefly families of the Éile tribe who in turn came from the Dumnonii or Laigin who were the third wave of Celts to settle in Ireland during the first century BC.
Notable people with this surname include:
Aodhán Ó Ríordáin (born 1976), Irish politician Brendan O'Riordan, Irish football player Brian O'Riordan (born 1981), Irish rugby player Cait O'Riordan (born 1965), British rock musician Conal Holmes O'Connell O'Riordan (1874–1948), Irish dramatist and novelist Dolores O'Riordan (1971–2018), Irish singer and songwriter Don O'Riordan (born 1957), Irish football player and coach Eugene O'Riordan, Irish author and professor of mathematics Jerry O'Riordan (1925–1987), Irish hurler Julius O'Riordan (born 1966), British DJ Mark O'Riordan (born 1980), Irish hurler Michael O'Riordan (1917–2006), Irish communist; founder of the Communist Party of Ireland Mossy O'Riordan (1926–2008), Irish hurler Rachel O'Riordan (born 1974), Irish theatre director Robert O'Riordan (1943–2004), Canadian author Seán Ó Ríordáin (1917–1977), Irish poet
See also Riordan, a surname Irish clans
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