Where does “Donncha” come from?

Donncha (Irish) comes from Old Irish Donnchad, from Old Irish cath, from Primitive Irish ᚉᚐᚈᚈᚒ, from Proto-Celtic katus, from Proto-Indo-European kéh₃tus, from Proto-Indo-European -tus — Derives action nouns from verb roots.

Ancestry of “Donncha”, step by step

StepLanguageWordMeaning
1Old IrishDonnchad—
2Old Irishcathbattle, fight; troop, battalion
3Primitive Irishᚉᚐᚈᚈᚒbattle
4Proto-Celtickatusbattle
5Proto-Indo-Europeankéh₃tusfight
6Proto-Indo-European-tusDerives action nouns from verb roots
Every word from Proto-Indo-European -tus →Every word from Proto-Indo-European kéh₃tus →Every word from Proto-Celtic katus →