|Easton's Bible Dictionary|
Fortress, one of the Edomitish "dukes" descended from Esau (Genesis 36:42; 1 Chronicles 1:53).
Int. Standard Bible Encyclopedia
mib'-zar (mibhtsar, "a fortress"): An Edomite chief, the King James Version "duke" (Genesis 36:42 1 Chronicles 1:53). According to Eusebius, Mibzar is connected with Mibsara, a considerable village subject to Petra and still existing in his time. Compare Holzinger and Skinner in respective commentaries on Genesis.
Mibzar (2 Occurrences)
Genesis 36:42 chief Kenaz, chief Teman, chief Mibzar, (WEB KJV JPS ASV BBE DBY WBS YLT NAS RSV NIV)
1 Chronicles 1:53 chief Kenaz, chief Teman, chief Mibzar, (WEB KJV JPS ASV BBE DBY WBS YLT NAS RSV NIV)