Quick answer
Osiris is a boy name meaning "mighty; eye".
Pronunciation: English /oʊ.ˈsaɪ.ɹɪs/.
Meaning and history
Greek form of the Egyptian wsjr (reconstructed as Asar, Usir and other forms), which is of unknown meaning, possibly related to wsr "mighty" or jrt "eye". In Egyptian mythology Osiris was the god of fertility, agriculture, and the dead and served as the judge of the underworld. In one tale he was slain by his brother Seth, but restored to life by his wife Isis in order to conceive their son Horus, who would go on to avenge his father.
Notes and context
Usage: egyptian mythology | Ancient Greek: Ὄσιρις