Family History and Genealogy Resources by Surname
Kavanagh Surname Origin
(Origin Celtic or Gaelic) Coamhanach, mild, benevolent, merciful; a friend, a companion. Mr. John O'Donovan says, that Donnell Cavanagh was so called from having been fostered by the Coarb of St. Cavan, at Kilcavan, in the present county of Wexford, Ireland.
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.
Kavanagh Surname Meaning and Family Facts
There is more to Kavanagh family history than the origin of your surname:
A Kavanagh Family History Thought:
What is past is prologue.