Ó Déaghain
Ó DÉAGHAIN—III—O Dyeane, O Deane, O Dane, Deane, Dean, Deen, Dane; 'descendant of the dean' (Irish déadhan or déaghan); a scattered surname; found at the end of the 16th century in many parts of the south of Ireland, and also in Donegal.
Alphabetical Index to Irish Surnames