וְאֶת־מַלְכֵ֨י מִדְיָ֜ן הָרְג֣וּ עַל־חַלְלֵיהֶ֗ם אֶת־אֱוִ֤י וְאֶת־רֶ֙קֶם֙ וְאֶת־צ֤וּר וְאֶת־חוּר֙ וְאֶת־רֶ֔בַע חֲמֵ֖שֶׁת מַלְכֵ֣י מִדְיָ֑ן וְאֵת֙ בִּלְעָ֣ם בֶּן־בְּע֔וֹר הָרְג֖וּ בֶּחָֽרֶב׃
And they slew the kings of Midian with the rest of their slain: Evi, and Rekem, and Zur, and Hur, and Reba, the five kings of Midian; Balaam also the son of Beor they slew with the sword.
Read kabbalistic (mystical) interpretation of Numbers 31:8: and classical mystical sources.