Where does “葦鹿” come from?

葦鹿 (Japanese) comes from Japanese 鹿, from Middle Chinese 鹿.

葦鹿 (Japanese): a sea lion

Definitions

Step	Language	Word	Meaning
1	Japanese	鹿	deer; deer meat: venison; a beast
2	Middle Chinese	鹿	—

葦鹿 — Etymology, Origin & Word History | Etymology Explorer