Adam Clarke on 1 Kings 11:18

These arose out of Midian - They at first retired to Midian, which lay to the southwest of the Dead Sea. Not supposing themselves in safety there, they went afterwards to Paran in the south of Idumea, and getting a number of persons to join them in Paran, they went straight to Egypt, where we find Hadad became a favourite with Pharaoh, who gave him his sister-in-law to wife; and incorporated him and his family with his own.