Revelation 9:11

9:11 They have as king over them the angel of the abyss, whose name in Hebrew is Abaddon, and in Greek, Apollyon. ¹ 

Revelation 17:11

17:11 The ²  beast that was, and is not, is himself an eighth king and yet is one of the seven, and is going to destruction.

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¹ sn Both the Hebrew Abaddon and the Greek Apollyon mean “Destroyer.”

² tn Here καί (kai) has not been translated because of differences between Greek and English style.