Charles Ellicott Commentary 1 Chronicles 1:33

"And the sons of Midian: Ephah, and Epher, and Hanoch, and Abida, and Eldaah. All these were the sons of Keturah." — 1 Chronicles 1:33 (ASV)

The five clans or tribes of Midian. These, with the seven names of 1 Chronicles 1:31, make a total of twelve tribes for Keturah.

Ephah. Called Hâ’âpâ, or Hayâpa by Tiglath-pileser.