Does anybody know anything about the last name Duffey most likely stemming from the Fermanagh area?

Duffy: ( O'Dufaigh) There were 198 Duffys on teh voters register in 1968. Some are from the clan in co Monaghan. Those living along Lower Lough Erne are descended from teh Ui Bruinin Breffny Duffys. The MOnaghan Duffys had their centre at Teallach Gealacain in the parish of Clontibret. The Fermanagh Duffys came from Breffny to live at Baile Ui Dhubhthaighm near Belleek. This latter clan were represented on the 1796 freeholders lists by Terence, Laurence, Patrick, Bernard, Michael, Owen, Murtagh and Denis, all from the Parish of Inishmacsaint.