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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There is more to O'Callaghan family history than the origin of your surname:

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A O'Callaghan Family History Thought:

'If you would not be forgotten,
As soon as you are dead and rotten,
Either write things worthy of reading,
Or do things worthy of writing.' --Benjamin Franklin, May 1738

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