Where does “dux” come from?

dux (Old English) comes from Proto-Germanic duskaz, from Proto-Indo-European dʰuh₂s-, from Proto-Indo-European dʰewh₂- — smoke; mist, haze.

Ancestry of “dux”, step by step

StepLanguageWordMeaning
1Proto-Germanicduskazdark, dark-colored, dusky
2Proto-Indo-Europeandʰuh₂s-—
3Proto-Indo-Europeandʰewh₂-smoke; mist, haze
Every word from Proto-Indo-European dʰewh₂- →Every word from Proto-Indo-European dʰuh₂s- →Every word from Proto-Germanic duskaz →