Zur

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

the name means Rock Easton's Bible Dictionary

Zur was one of five Midianite kings defeated by Israel during the conquest of Canaan.

From Easton's Bible Dictionary

Rock. (1.) One of the five Midianite kings whom the Israelites defeated and put to death (Num. 31:8).

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.