Where does “belu” come from?

belu (Middle English) comes from Middle English beli, from Old English bælg, from Proto-Germanic balgiz, from Proto-Indo-European bʰelǵʰ-, from Proto-Indo-European bʰel-, from Proto-Indo-European bʰōl-.

Ancestry of “belu”, step by step

Step	Language	Word	Meaning
1	Middle English	beli	—
2	Old English	bælg	belly
3	Proto-Germanic	balgiz	bag
4	Proto-Indo-European	bʰelǵʰ-	to swell
5	Proto-Indo-European	bʰel-	to sound; to speak, roar, bark; shiny, white; to...
6	Proto-Indo-European	bʰōl-	—

Every word from Proto-Indo-European bʰōl- →Every word from Proto-Indo-European bʰel- →Every word from Proto-Indo-European bʰelǵʰ- →