Duke in the Bible

Genesis 36:15-43 These were dukes of the sons of Esau: the sons of Eliphaz the firstborn son of Esau; duke Teman, duke Omar, duke Zepho, duke Kenaz, 16 Duke Korah, duke Gatam, and duke Amalek: these are the dukes that came of Eliphaz in the land of Edom; these were the sons of Adah. 17 And these are the sons of Reuel Esau's son; duke Nahath, duke Zerah, duke Shammah, duke Mizzah: these are the dukes that came of Reuel in the land of Edom; these are the sons of Bashemath Esau's wife. 18 And these are the sons of Aholibamah Esau's wife; duke Jeush, duke Jaalam, duke Korah: these were the dukes that came of Aholibamah the daughter of Anah, Esau's wife. ...
Exodus 15:15 Then the dukes of Edom shall be amazed; the mighty men of Moab, trembling shall take hold upon them; all the inhabitants of Canaan shall melt away.
1 Chronicles 1:51-54 Hadad died also. And the dukes of Edom were; duke Timnah, duke Aliah, duke Jetheth, 52 Duke Aholibamah, duke Elah, duke Pinon, 53 Duke Kenaz, duke Teman, duke Mibzar, 54 Duke Magdiel, duke Iram. These are the dukes of Edom.

Joshua 13:21 And all the cities of the plain, and all the kingdom of Sihon king of the Amorites, which reigned in Heshbon, whom Moses smote with the princes of Midian, Evi, and Rekem, and Zur, and Hur, and Reba, which were dukes of Sihon, dwelling in the country.