Hastings' Dictionary of the Bible 
Basemath . 1 . One of the wives of Esau. In Genesis 26:34 (P [Note: Priestly Narrative.] ) she is called the daughter of Elon the Hittlte, while in Genesis 36:3 (prob. R [Note: Redactor.] ) she is said to have been Ishmael’s daughter, and sister of Nebaioth. But in Genesis 28:9 (P [Note: Priestly Narrative.] ) Esau is said to have taken Mahalath , the daughter of Ishmael, the sister of Nebaioth, to be his wife; and in Genesis 36:2 the first mentioned of Esau’s wives is Adah , the daughter of Elon the Hittite. There is manifestly a confusion of names in the text, which cannot be satisfactorily explained. 2 . A daughter of Solomon, who became the wife of Ahimaaz, one of the king’s officers ( 1 Kings 4:15 ).
Holman Bible Dictionary 
Genesis 26:1 34-35 Genesis 27:46 Genesis 28:9 Genesis 36:3 Genesis 36:10 36:13 36:17 2 1 Kings 4:15