Where does “কোল” come from?

কোল (Bengali) comes from Bengali বালিশ, from Classical Persian بَالِش, from Pahlavi 𐭡𐭠𐭫𐭱𐭭, from Proto-Iranian barjíš, from Proto-Indo-Iranian bʰarȷ́ʰíš, from Proto-Indo-European bʰelǵʰ-, from Proto-Indo-European bʰel-, from Proto-Indo-European bʰōl-.

কোল (Bengali): lap

Definitions

Ancestry of “কোল”, step by step

Step	Language	Word	Meaning
1	Bengali	বালিশ	pillow
2	Classical Persian	بَالِش	—
3	Pahlavi	𐭡𐭠𐭫𐭱𐭭	—
4	Proto-Iranian	barjíš	—
5	Proto-Indo-Iranian	bʰarȷ́ʰíš	pillow; bed or layer of grass
6	Proto-Indo-European	bʰelǵʰ-	to swell
7	Proto-Indo-European	bʰel-	to sound; to speak, roar, bark; shiny, white; to...
8	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- →