Where does “bulla” come from?

bulla (Old Irish) comes from Latin bulla, from Proto-Indo-European bʰel-, from Proto-Indo-European bʰōl-.

Ancestry of “bulla”, step by step

Step	Language	Word	Meaning
1	Latin	bulla	a bubble; a swollen or bubble-shaped object,...
2	Proto-Indo-European	bʰel-	to sound; to speak, roar, bark; shiny, white; to...
3	Proto-Indo-European	bʰōl-	—

bulla — Etymology, Origin & Word History | Etymology Explorer