Where does “ナルキッソス” come from?

ナルキッソス (Japanese) comes from Ancient Greek Νάρκισσος — Narcissus.

Ancestry of “ナルキッソス”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	Νάρκισσος	Narcissus

ナルキッソス — Etymology, Origin & Word History | Etymology Explorer