Quick answer
Orion is a boy name meaning "boundary, limit; light of the heavens".
Pronunciation: Classical Greek /ɔː.rǐː.ɔːn/; English /oʊ.ˈɹaɪ.ən/.
Meaning and history
Meaning uncertain, but possibly related to Greek ὅριον (horion) meaning "boundary, limit". Alternatively it may be derived from Akkadian 𒌋𒊒𒀭𒈾 (Uru-anna) meaning "light of the heavens". This is the name of a constellation, which gets its name from a legendary Greek hunter who was killed by a scorpion sent by the earth goddess Gaia.
Notes and context
Usage: greek mythology | Ancient Greek: Ὠρίων