What does the name Apollyon mean in Revelation 9?
In Revelation 9, the name Apollyon is the Greek name of the king over the locust-like creatures, the angel of the bottomless pit. It means 'the destroyer.' His Hebrew name is Abaddon. The text identifies him as a king over them, not necessarily Satan, but likely one of Satan's lieutenants.
Les explains that in Revelation 9 the creatures have a king over them, the angel of the bottomless pit. His name in the Hebrew tongue is Abaddon, but in Greek his name is Apollyon, which really means 'the destroyer.' Les says beyond that we do not know who this angel is. He is quite sure it is not Satan, but probably one of Satan's cohorts or lieutenants, though some may feel it is Satan. This follows the locust-like swarm whose sound is like many chariots and whose tails sting like scorpions for five months. Verse 12 notes that one woe is past, with two more to come.
And they had a king over them, which is the angel of the bottomless pit, whose name in the Hebrew tongue is Abaddon, but in the Greek tongue hath his name Apollyon.