Where does “hæle” come from?

hæle (Middle English) comes from Old English hǣlu, from Proto-Germanic hailį̄, from Proto-Germanic hailaz, from Proto-Indo-European *kéh₂ilos.

Ancestry of “hæle”, step by step

Step	Language	Word	Meaning
1	Old English	hǣlu	health, safety
2	Proto-Germanic	hailį̄	salvation, health
3	Proto-Germanic	hailaz	whole, unbroken, intact; entire, complete; hale,...
4	Proto-Indo-European	*kéh₂ilos	—

hæle — Etymology, Origin & Word History | Etymology Explorer