Usage: 3 forms in 6 verses
Form Translated As     In Verse(s)
επάρχουσ chief rulers LXX.Neh.2.7LXX.Neh.2.9
επάρχοισ chief rulers LXX.Ezra.8.36
έπαρχοσ chief ruler LXX.Ezra.5.3LXX.Ezra.5.6LXX.Ezra.6.13

Liddell-Scott-Jones

ἔπαρχος (eparchos) a chief ruler G:N-M

ἔπαρχος-ος, ον,

commander, Κιλίκων [Refs 4th c.BC+]; governor of a country, [Refs 2nd c.BC+]. = Latin praefectus (in all senses), [Refs 1st c.AD+]; . τεκτόνων or τεχνιτῶν, pracf. fabrum, [Refs]; . τῆς πόλεως, praef. urbi, [Refs 1st c.BC+]; . παρεμβολῶν, praef. castrorum, [Refs 2nd c.AD+]; . τῆς αὐλῆς, praef. praetorio, [Refs 1st c.AD+]; . Ἑῴας prefect of the East, [Refs]; ἀπὸ ἐπάρχων, ex praefecto, [Refs 4th c.AD+]

__II as adjective, ἀρχὴν ἔπαρχοςον στόλου the office of admiral, [Refs 3rd c.AD+]