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. |