Where does “verdun” come from?

verdun (English) comes from French Verdun, from Latin Virodunum, from Proto-Celtic dūnom, from Proto-Indo-European dʰewh₂- — smoke; mist, haze.

Ancestry of “verdun”, step by step

Step	Language	Word	Meaning
1	French	Verdun	—
2	Latin	Virodunum	—
3	Proto-Celtic	dūnom	stronghold, rampart
4	Proto-Indo-European	dʰewh₂-	smoke; mist, haze

verdun — Etymology, Origin & Word History | Etymology Explorer