Where does “eiȝle” come from?

eiȝle (Middle English) comes from Old English eġl, from Proto-Germanic agilō — awn.

Ancestry of “eiȝle”, step by step

Step	Language	Word	Meaning
1	Old English	eġl	an ail; awn; beard of barley; mote
2	Proto-Germanic	agilō	awn