Where does “Dunn” come from?

Dunn (English) comes from Irish Ó Duinn, from Irish Donn, from Old Irish donn, from Proto-Celtic dusnos, from Proto-Indo-European dʰewh₂- — smoke; mist, haze.

Ancestry of “Dunn”, step by step

StepLanguageWordMeaning
1IrishÓ Duinn—
2IrishDonnthe legendary ancestor of the Gaels
3Old Irishdonnbrown, tawny, dun; hazel; chestnut
4Proto-Celticdusnosdark, brown
5Proto-Indo-Europeandʰewh₂-smoke; mist, haze
Every word from Proto-Indo-European dʰewh₂- →Every word from Proto-Celtic dusnos →Every word from Old Irish donn →