O'leary Family History
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O'leary Name Meaning
Irish (Munster): Americanized form of Ó Laoghaire ‘descendant of Laoghaire’, a byname originally meaning ‘keeper of the calves’, from laogh ‘calf’. This was the name of a 5th-century king of Ireland.
Source: Dictionary of American Family Names ©2013, Oxford University Press