Hur

A king, in the time of Egypt and Wilderness · Sinai · named in 2 verses

Hur was one of the five Midianite kings slain by the Israelites during the time of Moses.

From Easton's Bible Dictionary

A hole, as of a viper, etc.

Easton's Illustrated Bible Dictionary, 1897 — public domain, quoted in full and unedited.

First named at Numbers 31:8.

Numbers 31:8 Among the slain were Evi, Rekem, Zur, Hur, and Reba—the five kings of Midian. They also killed Balaam son of Beor with the sword.
Joshua 13:21 all the cities of the plateau and all the kingdom of Sihon king of the Amorites, who reigned in Heshbon until Moses killed him and the chiefs of Midian (Evi, Rekem, Zur, Hur, and Reba), the princes of Sihon who lived in the land.