Zerah

Zerah son to Reuel and grandson to Esau

Gen 36:13  And these are the sons of Reuel; Nahath, and Zerah, Shammah, and Mizzah: these were the sons of Bashemath Esau's wife. 

Gen 36:17  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. 

1Ch 1:37  The sons of Reuel; Nahath, Zerah, Shammah, and Mizzah.