Where does “heil” come from?

heil (Middle High German) comes from Old High German heil, from Proto-West Germanic hail, from Proto-Germanic hailaz, from Proto-Indo-European *kéh₂ilos.

Ancestry of “heil”, step by step

Step	Language	Word	Meaning
1	Old High German	heil	whole; luck
2	Proto-West Germanic	hail	healthy, sound; whole; omen, portent
3	Proto-Germanic	hailaz	whole, unbroken, intact; entire, complete; hale,...
4	Proto-Indo-European	*kéh₂ilos	—

Words derived from “heil”

Heilsgeschichte
heil
Sieg Heil
heilbar
Heilwasser
heillos
Heil
Heilsgeschichte
heil
unheilbar
heilbringend
Heilanstalt
Nervenheilanstalt

Every word from Proto-Indo-European *kéh₂ilos →

heil — Etymology, Origin & Word History | Etymology Explorer