Revelation 9:11

Ἔχουσαι βασιλέα ἐπ᾽ αὐτῶν ἄγγελον τῆς ἀβύσσου· ὄνομα αὐτῷ Ἑβραϊστὶ Ἀββαδών, ἐν δὲ τῇ Ἑλληνικῇ ὄνομα ἔχει Ἀπολλύων.

RBT Greek Interlinear:

Strongs 2192; echousin; ἔχουσιν; they have; V-PIA-3P

Strongs 1909; ep’; ἐπ’; upon; Prep

Strongs 846; autōn; αὐτῶν; of themselves; PPro-GF3P

Strongs 935; basilea; βασιλέα; a king; N-AMS

Strongs 3588; ton; τὸν; the; Art-AMS

Strongs 32; angelon; ἄγγελον; angel; N-AMS

Strongs 3588; tēs; τῆς; the; Art-GFS

Strongs 12; abyssou; ἀβύσσου; Abyss; N-GFS

Strongs 3686; onoma; ὄνομα; name; N-NNS

Strongs 846; autō; αὐτῷ; to himself; PPro-DM3S

Strongs 1447; Hebraisti; Ἑβραϊστί; in Hebrew; Adv

Strongs 3; Abaddōn; Ἀβαδδών; [is] Abaddon; N-NMS

Strongs 2532; kai; καὶ; and; Conj

Strongs 1722; en; ἐν; within; Prep

Strongs 3588; tē; τῇ; the; Art-DFS

Strongs 1673; Hellēnikē; Ἑλληνικῇ; Greek; Adj-DFS

Strongs 3686; onoma; ὄνομα; name; N-ANS

Strongs 2192; echei; ἔχει; has; V-PIA-3S

Strongs 623; Apollyōn; Ἀπολλύων; Apollyon; N-NMS

RBT Translation:

Wrong King Holding the Wrong King

They are holding a king over themselves, the Angel of the Abyss, the name to himself in Hebrew is Abaddon, and within the Greek he is holding the name Apollyon.

אבדון
Abbadon
"Inner Destroyer"Ἀπολλύων
Apollyon
"The Destroyer"

Apollyon | Abbadon

The Pantokrator holds the Book in the Left Hand...

(cf. Wikipedia Christ Pantokrator)

LITV Translation:
And they have a king over them, the angel of the abyss. In Hebrew his name was Abaddon, and in Greek he has the name Apollyon.

ESV Translation:
They have as king over them the angel of the bottomless pit. His name in Hebrew is Abaddon, and in Greek he is called Apollyon.