The surname O'Dennehy was first found in Cork (Irish: Corcaigh) the ancient Kingdom of Deis Muin (Desmond), located on the southwest coast of Ireland in the province of Munster, and Kerry where they held a family seat. The first recorded instance of the name is of Donall O'Denaghie of Cloghlea, County Cork, a vestarius (keeper of the vestry) in 1585. According to Irish lore, bearers of this name were traditionally descended from Maoin, brother of Muircaertach Mor MacEarca, King of Ireland. Many Irish sept (clann) names were intermixed and family groupings became almost indistinguishable. Bearers of this name often changed Danagher to Dennehy, and Dennehy to Denny.
Early History of the O'Dennehy family
This web page shows only a small excerpt of our O'Dennehy research. Another 74 words (5 lines of text) covering the years 1828, 1829, 1865 and 1907 are included under the topic Early O'Dennehy History in all our PDF Extended History products and printed products wherever possible.
O'Dennehy Spelling Variations
Spelling variations of this family name include: Dennehy, Denehy, O'Dennehy, O'Denehy, Denesy and many more.
Early Notables of the O'Dennehy family
Another 50 words (4 lines of text) are included under the topic Early O'Dennehy Notables in all our PDF Extended History products and printed products wherever possible.
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Migration of the O'Dennehy family
Some of the first settlers of this family name or some of its variants were: Patrick Denehy, who was naturalized in New York city in 1836; Philip Denehy, who was recorded in New York in 1851; Dennis Denehey, who was naturalized in Michigan in 1850.
