EVI (ē'vī, Heb. ‘ěwî). One of the five kings of Midian killed by the Israelites during their encampment in the plains of Moab (Num.31.8). His land was allotted to Reuben (Josh.13.21).
EVI ē’ vī (אֱוִ֤י, LXX Ευεί, desire). A Midianite king slain by the Israelites.
Evi was one of the five kings of Midian whom the Israelites slew (Num 31:8). This was apparently an act of vengeance. Earlier, the Lord had said to Moses, “Harass the Midianites and smite them; for they have harassed you with their wiles, with which they beguiled you...” (Num 25:16ff.). Evi, along with the four other kings, receives mention in Joshua 13:21. There they are called “princes of Sihon.”
International Standard Bible Encyclopedia (1915)
(’ewi, "desire"; Euei):
One of the five kings, or chiefs of the Midianites, slain by Israel during their sojourn in the plains of Moab (Nu 31:8; Jos 13:21).