Where does “bilȝe” come from?

bilȝe (Middle English) comes from Old Norse bylgja, from Proto-Germanic bulgijō, from Proto-Indo-European bʰelǵʰ-, from Proto-Indo-European bʰel-, from Proto-Indo-European bʰōl-.

Ancestry of “bilȝe”, step by step

Step	Language	Word	Meaning
1	Old Norse	bylgja	wave, billow
2	Proto-Germanic	bulgijō	wave, billow
3	Proto-Indo-European	bʰelǵʰ-	to swell
4	Proto-Indo-European	bʰel-	to sound; to speak, roar, bark; shiny, white; to...
5	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- →