Family History and Genealogy Resources by Surname
O'Callaghan Surname Origin
(Origin Celtic or Gaelic) The descendants or tribe of Callaghan, from Ciallach, prudent, judicious, discreet.
Source: An Etymological Dictionary of Family and Christian Names With an Essay on their Derivation and Import; Arthur, William, M.A.; New York, NY: Sheldon, Blake, Bleeker & CO., 1857.
O'Callaghan Surname Meaning and Family Facts
O'Callaghan Last Name Meaning
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A O'Callaghan Family History Thought:
'Not to know what happened before we were born is to remain perpetually a child. For what is the worth of a human life unless it is woven into the life of our ancestors by the records of history' -- Cicero