Where does “schein-” come from?

schein- (German) comes from German Schein, from Middle High German schīn, from Old High German scīn.

Ancestry of “schein-”, step by step

Step	Language	Word	Meaning
1	German	Schein	shine, gleam, flash; certificate, ticket; bill,...
2	Middle High German	schīn	—
3	Old High German	scīn	—

schein- — Etymology, Origin & Word History | Etymology Explorer