5 occurrences in 5 dictionaries
Reference: Reba
Easton
fourth, one of the Midianite chiefs slain by the Israelites in the wilderness (Nu 31:8; Jos 13:21).
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Hastings
One of the five kinglets of Midian slain by Moses (Nu 31:8; Jos 13:21).
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Smith
Re'ba
(four), one of the five kings of the Midianites slain by the children of Israel when Balaam fell.
(B.C. 1450.)