39%RatingSave Gender Masculine Usage Old Irish [1] Meaning & HistoryExpand Links Old Irish form of Donnchadh (see Duncan). Related NamesFamily Tree·Details Rootsdonn + cathOther Languages & CulturesDuncan(English) Donagh, Donnacha, Donncha, Donnchadh(Irish) Duncan(Scottish) Donnchadh(Scottish Gaelic) Categories brown, colors Sources & References O'Brien, Kathleen M. Index of Names in Irish Annals, available from https://medievalscotland.org/kmo/AnnalsIndex/Masculine/Donnchad.shtml.