Where does “Serapis” come from?

Serapis (Latin) comes from Ancient Greek Σάρᾱπις, from Egyptian wsjr-ḥp, from Egyptian wsjr — Osiris.

Ancestry of “Serapis”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	Σάρᾱπις	—
2	Egyptian	wsjr-ḥp	—
3	Egyptian	wsjr	Osiris

Serapis — Etymology, Origin & Word History | Etymology Explorer