Where does “gehorsam” come from?

gehorsam (German) comes from Middle High German gehōrsam, from Old High German gihōrsam, from Proto-West Germanic *gahauʀisam.

Ancestry of “gehorsam”, step by step

Step	Language	Word	Meaning
1	Middle High German	gehōrsam	—
2	Old High German	gihōrsam	—
3	Proto-West Germanic	*gahauʀisam	—

gehorsam — Etymology, Origin & Word History | Etymology Explorer