Where does “Osiris” come from?

Osiris is an English word derived from Ancient Greek Ὄσιρις, which was borrowed from Egyptian wsjr, a deity name of unknown original meaning.

Ancestry of “Osiris”, step by step

Step	Language	Word	Meaning
1	Latin	Osīris	—
2	Ancient Greek	Ὄσιρις	—
3	Egyptian	wsjr	Osiris