Where does “fligge” come from?

fligge (Middle English) comes from Old English flyċġe, from Proto-West Germanic *flugi, from Proto-Germanic flugjaz, from Proto-Indo-European plewk-, from Proto-Indo-European plew- — to fly, flow, run.

Ancestry of “fligge”, step by step

Step	Language	Word	Meaning
1	Old English	flyċġe	able to fly, fledged
2	Proto-West Germanic	*flugi	fledged, feathered
3	Proto-Germanic	flugjaz	able to fly, fledged
4	Proto-Indo-European	plewk-	to fly, flow, run; to splash, to flap with hands
5	Proto-Indo-European	plew-	to fly, flow, run

Every word from Proto-Indo-European plew- →Every word from Proto-Indo-European plewk- →Every word from Proto-Germanic flugjaz →