|Author||Rev Patrick Woulfe|
|Source||Irish Names and Surnames|
DONNCHADH, genitive -adha, -aidh, Donogh, Donough, Donaghy, (Donat, Denis, Duncan); Old Irish Donnchad, Dunchad, from Celt *Donno-catu-s, *Duno-catu-s, brown warrior, or strong warrior; an ancient and very common Irish name, still found in every part of the country, but generally anglicised Denis. The Scots make it Duncan. St. Dunchadh was Abbot of Iona; his feast was kept on 25th May. Latin — Donnchadus, Donatus.
Alphabetical Index to Names of Men (Irish-English)
Note: The old Irish letters used in the original text* have been converted to the Roman alphabet for this online version, and the lenited (or dotted) consonants changed to their aspirated equivalents, i.e. the dotted 'c' has been altered to 'ch', the dotted 'g' to 'gh', and the dotted 'm' to 'mh', etc. For example, in the name Caoimgin (Kevin), where the 'm' and 'g' are both dotted (ṁ, ġ) in the old Irish lettering, the name has been converted here to the modern Irish equivalent of Caoimhghin.
* Sloinnte Gaedheal is Gall: Irish Names and Surnames by Rev. Patrick Woulfe, 1923.