Where does “*buHnáh” come from?
*buHnáh (Proto-Iranian) comes from Proto-Indo-Iranian bʰudʰnás, from Proto-Indo-European bʰudʰ(m̥)nés, from Proto-Indo-European bʰudʰmḗn, from Proto-Indo-European dʰewbʰ-, from Proto-Indo-European dʰewh₂- — smoke; mist, haze.
Ancestry of “*buHnáh”, step by step