Where does “Ó Donnghaile” come from?

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

Ancestry of “Ó Donnghaile”, step by step

Ó Donnghaile traces back through two separate lines of ancestry.

via Irish Donn

StepLanguageWordMeaning
1IrishDonnthe legendary ancestor of the Gaels
2Old Irishdonnbrown, tawny, dun; hazel; chestnut
3Proto-Celticdusnosdark, brown
4Proto-Indo-Europeandʰewh₂-smoke; mist, haze

via Irish gal

StepLanguageWordMeaning
1Irishgalwarlike ardor; valor, fury; vapor, steam
2Old Irishgalvalour; valor; warlike ardour, fury
3Proto-Celticgalāmight, ability
Every word from Proto-Indo-European dʰewh₂- →Every word from Proto-Celtic dusnos →Every word from Old Irish donn →