Where does “doppelganger” come from?

Doppelgänger comes from German Doppelgänger, from German Gänger, from Middle High German genger, a walker or goer.

doppelganger (English): A ghostly double of a living person, especially...

Definitions

Step	Language	Word	Meaning
1	German	Doppelgänger	doppelganger, doppelgänger
2	German	doppel-	duplicate, double; double
3	German	Doppel	doubles; duplicate
4	Middle Dutch	dubbel	—
5	French	doublé	double, brace, pair; double; doublé
6	Middle French	double	—
7	Old French	doble	double
8	Latin	dūplus	—
9	Proto-Italic	*duplos	—

doppelganger — Etymology, Origin & Word History | Etymology Explorer