Genesis 36:3

"And Bashemath Ishmael’s daughter, sister of Nebajoth."

Cross References (ranked by relevance)

Then went Esau unto Ishmael, and took unto the wives which he had Mahalath the daughter of Ishmael Abraham’s son, the sister of Nebajoth, to be his wife.

Genesis 25:13

And these are the names of the sons of Ishmael, by their names, according to their generations: the firstborn of Ishmael, Nebajoth; and Kedar, and Adbeel, and Mibsam,