Where does “Narzissmus” come from?

Narzissmus (German) comes from German Narziss, from Latin Narcissus, from Ancient Greek Νάρκισσος — Narcissus.

Ancestry of “Narzissmus”, step by step

Step	Language	Word	Meaning
1	German	Narziss	—
2	Latin	Narcissus	—
3	Ancient Greek	Νάρκισσος	Narcissus

Narzissmus — Etymology, Origin & Word History | Etymology Explorer