Parallel
Revelation 9:11
Patriarchal Greek New Testament (1904) · Berean Standard Bible
ἔχουσι βασιλέα ἐπ᾽ αὐτῶν [τὸν] ἄγγελον τῆς ἀβύσσου· ὄνομα αὐτῷ Ἑβραϊστὶ Ἀβαδδών, ἐν δὲ 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.).