O'Cosgrave
O'Coulter or Colter
O'Coyne
O'Crean
O'Crehall
O'Crotty
O'Crowley or Crouley
O'Cullen or Culhoun
O'Cullinan
O'Currie
O'Daly or Dawley
O'Dane
O'Dargan, MacDeargan
O'Davoren
O'Dea or Day
O'Delany
Odell
O'Dempsey
O'Dennehy or Denny
O'Dermond
O'Desmond
O'Devaney
O'Devlin
O'Dinneen
O'Doherty or Dogherty
O'Doinn, Dunn, Doyne
O'Dolan I
O'Dolan II
O'Donegan or Donagan
O'Donellan or Donlon
O'Donlevy
O'Donnell
O'Donnelly
O'Donoghue
O'Donovan
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