Where does “Ó Donndubhartaigh” come from?

Ó Donndubhartaigh (Irish) comes from Irish dubh, from Old Irish dub, from Proto-Celtic dubus, from Proto-Indo-European dʰewbʰ-, from Proto-Indo-European dʰewh₂- — smoke; mist, haze.

Ancestry of “Ó Donndubhartaigh”, step by step

Ó Donndubhartaigh traces back through 3 separate lines of ancestry.

via Irish dubh

StepLanguageWordMeaning
1Irishdubhblack; black-haired
2Old Irishdubblack; morally dark, dire, gloomy, melancholy;...
3Proto-Celticdubusblack
4Proto-Indo-Europeandʰewbʰ-deep
5Proto-Indo-Europeandʰewh₂-smoke; mist, haze

via Irish Donn

StepLanguageWordMeaning
1IrishDonnthe legendary ancestor of the Gaels
2Old Irishdonnbrown, tawny, dun; hazel; chestnut
3Proto-Celticdusnosdark, brown

via Irish Artach

StepLanguageWordMeaning
1IrishArtachArctic
Every word from Proto-Indo-European dʰewh₂- →Every word from Proto-Indo-European dʰewbʰ- →Every word from Proto-Celtic dubus →