Tosefta for Genesis 25:2

וַתֵּ֣לֶד ל֗וֹ אֶת־זִמְרָן֙ וְאֶת־יָקְשָׁ֔ן וְאֶת־מְדָ֖ן וְאֶת־מִדְיָ֑ן וְאֶת־יִשְׁבָּ֖ק וְאֶת־שֽׁוּחַ׃

And she bore him Zimran, and Jokshan, and Medan, and Midian, and Ishbak, and Shuah.