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Ó Núanáin, Noonan, ÓhIonmhaineáin


Noonan is the anglicized modern form of the well-attested Irish surname Ó Núanáin, which in turn appears to be descended through the Middle-Irish family name Ó hIonmhaineáin from the Early-Irish Ua Nemhnainn, the cognomen of one of the three battalions of the 3rd-century Fianna Érieann.