Ó Ceallacháin,libraryireland.com: Rev Patrick Woulfe. Irish Names and Surnames. 1923 primarily anglicised O'Callaghan as well as variants of Callihan, is an Irish surname. Notable people with the surname include:
Pat O'Callaghan (1906–1991), Irish hammer-thrower Seán Óg Ó Ceallacháin (1923–2013), journalist, author and broadcaster Bill Callihan (1916–1986), American football player Davey Callihan (b. 1989), American racing driver Deby Callihan, American poker player Mike Callihan (b. 1947), Lieutenant Governor of Colorado Richard Callihan (b. 1961), American racing driver Sami Callihan (b. 1987), American wrestler Tyler Callihan (b. 2000), American baseball player
See also Callahan (disambiguation) Callaghan (disambiguation)
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