וּבְנֵ֣י מִדְיָ֗ן עֵיפָ֤ה וָעֵ֙פֶר֙ וַחֲנֹ֔ךְ וַאֲבִידָ֖ע וְאֶלְדָּעָ֑ה כָּל־אֵ֖לֶּה בְּנֵ֥י קְטוּרָֽה׃
And the sons of Midian: Ephah, and Epher, and Hanoch, and Abida, and Eldaah. All these were the children of Keturah.
Read kabbalistic (mystical) interpretation of Genesis 25:4: and classical mystical sources.