Where does “sprāche” come from?

sprāche (German) comes from Middle High German sprāche, from Old High German sprāhha, from Proto-West Germanic *sprāku.

Ancestry of “sprāche”, step by step

Step	Language	Word	Meaning
1	Middle High German	sprāche	—
2	Old High German	sprāhha	—
3	Proto-West Germanic	*sprāku	—

sprāche — Etymology, Origin & Word History | Etymology Explorer