Apollyon

n. angel of hell and destruction

Apollyon appears in the  New Testament (Book of Revelation 9:7–11) leading the  locust plague that will be released on Gods enemies in the End Times: The name is Greek for "Destroyer" (Απολλυων, from απολλυειν, to destroy). It also echoes the unrelated Hebrew Abaddon (lit. "place of destruction," but here personified) and the name of the Greek god Apollo, also a "destroyer" in his aspect of controlling pestilence, though the composite monstrosity that is Apollyon is distinctly Babylonian and Persian, not Hellenic, in inspiration. Apollyon seems to be equated in Revelation with the Beast. The term "Apollyon" was often associated by early Christians with The Devil, and fancifully described, and is still used as an alternative name for him.
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(n.)
The Destroyer; -- a name used (Rev. ix. 11) for the angel of the bottomless pit, answering to the Hebrew Abaddon.
  

[Greek] "The destroyer". In the new testament of the Bible, Apollyon is called the angel of the bottomless pit. Abaddon, a poetic name for the land of the dead in the old testament, is Apollyon's Greek translation from the Hebrew language. Apollyon, in early Christian literature, is a name for the devil. He is identified as an angel of death, "hideous to behold, with scales like a fish, wings like a dragon, bear's feet, and a lion's mouth."

Apollyon (Greek) The destroyer; derived from the same verb as Apollo, the term recognizes that involved in every growth there is an equivalent energy of destruction or dissipation, which aids the new growth. Originally a significant mystical term, it became in Christian times one of the aliases of Satan. Ecclesiastical monotheism required that some of the beneficent creative powers should be eliminated from heaven and relegated to the bottomless pit.