The Name Dunadd seems to be derived from the scottish Kingdom Dunadd, often believed to come from a place name Dùn Ad, "fort on River Add".A possible rendering into middle welsh could be Dinasadd or Dinasafon, but maybe the Arthurian Name Dinadan or welsh Dwnad, "Rumour, Tradition" (anglicized as Dunad) would be closer to the original form.