The surname Deenihan is an Anglicization of the original Irish Gaelic surname Ó Duinneachain. 1
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Early Origins of the Deenihan family
The surname Deenihan was first found in County Limerick (Irish: Luimneach) located in Southwestern Ireland, in the province of Munster, where it belonged to a small sept in the barony of Owney.
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Early History of the Deenihan family
This web page shows only a small excerpt of our Deenihan research. Another 51 words (4 lines of text) covering the years 1666, 1851, 1853 and 1901 are included under the topic Early Deenihan History in all our PDF Extended History products and printed products wherever possible.
Deenihan Spelling Variations
Spelling variations of this family name include: Deenihan, Dinaghan, Denihan, Dynahan, O'Deenihan and others.
Early Notables of the Deenihan family
Notable among the family name at this time was
the Deenihan family of County Kerry
Deenihan migration to the United States
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Some of the first settlers of this family name were:
Deenihan Settlers in United States in the 19th Century
Catherine and William Deenihan, who immigrated to New York with their children in 1852
Contemporary Notables of the name Deenihan (post 1700)
Deenihan migration to the United States 
Ireland
