Where does “Osíris” come from?

Osíris (Portuguese) comes from Latin Osīris, from Ancient Greek Ὄσιρις, from Egyptian wsjr — Osiris.

Ancestry of “Osíris”, step by step

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