Cushan

Boyd’s Bible Dictionary:

(blackness) (Hab. 3:7). Some refer it to Cush.

Concise Bible Dictionary:

Perhaps Ethiopia (Hab. 3:7, as in the margin); or it may refer to Chushan-rishathaim, the first recorded oppressor in the time of the judge (Judg. 3:8-10).

Strong’s Dictionary of Hebrew Words:

Transliteration:
Kuwshan
Phonic:
koo-shawn’
Meaning:
perhaps from 3568; Cushan, a region of Arabia
KJV Usage:
Cushan

Jackson’s Dictionary of Scripture Proper Names:

their blackness

Potts’ Bible Proper Names:

Great fear; blackness:― a region of Arabia [CHUSHAN-RISHATHAIM], Hab. 3:7. {Timor magnus}