Ó Ceallacháin,libraryireland.com: Rev Patrick Woulfe. Irish Names and Surnames. 1923
/ref> 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 * Mike Callihan (b. 1947), Lieutenant Governor of Colorado * Ryan Callahan, American hockey player * Shane Callahan (b. 1995), American actor

References

See also