Parallel
Revelation 9:11
CNTR Statistical Restoration · Berean Standard Bible
Ἔχουσιν ἐπʼ αὐτῶν βασιλέα, τὸν ἄγγελον τῆς Ἀβύσσου· ὄνομα αὐτῷ Ἑβραϊστὶ, Ἀβαδδών, καὶ ἐν τῇ Ἑλληνικῇ ὄνομα ἔχει, Ἀπολλύων.
They were ruled by a king, the angel of the Abyss. His name in Hebrew is Abaddon, and in Greek it is Apollyon (note: Apollyon means Destroyer.).