Strong's Definition
perhaps from 3568; Cushan, a region of Arabia: -Cushan.
STEPBible — Tyndale Abridged Hebrew Lexicon
כּוּשָׁן (ku.shan) — Cushan.
§ Cushan = "their blackness" a place in Arabia or Mesopotamia
UBS Dictionary of Biblical Hebrew
name
Names of Locations | Names of Groups
Cushan = land or ethnic group, possibly related to Midian
UBS Dictionary of Biblical Hebrew © United Bible Societies, licensed CC BY-SA 4.0.
Brown-Driver-Briggs Hebrew Lexicon
כּוּשָׁן n.pr., gent. vel terr., only Hb 3:7 ref