Donnchadh is a Gaelic masculine given name. It is composed of the elements donn, meaning "brown"; and chadh, meaning "chief" or "noble". The name is also written as Donnchad, Donncha, Donnacha, Donnchadha and Dúnchad. In English it's pronounced "Donn-ah" or "Donn-a-ha". Modern versions include (in Ireland) Donagh, Donough, Donogh and (in Scotland) Duncan. Also anglicised as Denis and Dionysius. The surnames McDonagh, O'Donoghue and Dunphy among others are derived from the given name (In Gae… (More on Donnchadh)