Where does “bȳl” come from?

bȳl (Old English) comes from Proto-Germanic būlō, from Proto-Indo-European bʰel-, from Proto-Indo-European bʰōl-.

Ancestry of “bȳl”, step by step

Step	Language	Word	Meaning
1	Proto-Germanic	būlō	boil; sore
2	Proto-Indo-European	bʰel-	to sound; to speak, roar, bark; shiny, white; to...
3	Proto-Indo-European	bʰōl-	—

bȳl — Etymology, Origin & Word History | Etymology Explorer