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|View category for people with the O'Dea surname|
O'Dea, pronounced "oh-dee" (IPA: /oːˈdiː/), is an Irish surname approximately 1,000 years old belonging to a family descended from a tenth century chieftain called Deághaidh. The clan came originally from the western coastal county of Clare. The English version of the name, O'Dea, is derived from Ó Deághaidh or Ua Deághaidh in the Irish language.