Where does “dobharchú” come from?

dobharchú (Irish) comes from Old Irish doburchú, from Proto-Celtic dubrokū, from Proto-Celtic dubros, from Proto-Indo-European dʰubʰrós, from Proto-Indo-European dʰewbʰ-, from Proto-Indo-European dʰewh₂- — smoke; mist, haze.

Ancestry of “dobharchú”, step by step

StepLanguageWordMeaning
1Old Irishdoburchúotter
2Proto-Celticdubrokūotter
3Proto-Celticdubrosdark; water
4Proto-Indo-Europeandʰubʰrósdeep
5Proto-Indo-Europeandʰewbʰ-deep
6Proto-Indo-Europeandʰewh₂-smoke; mist, haze

Words derived from “dobharchú

Every word from Proto-Indo-European dʰewh₂-Every word from Proto-Indo-European dʰewbʰ-Every word from Proto-Indo-European dʰubʰrós