They have (echousin | ἔχουσιν | pres act ind 3 pl) as king over them the angel of the abyss, whose name in Hebrew is Abaddon, but in Greek he (echei | ἔχει | pres act ind 3 sg) has (echei | ἔχει | pres act ind 3 sg) the name Apollyon.
Reference
Revelation 9:11
Sequence
578