3 occurrences across the corpus

King James Version

Genesis 28:9

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

2 Chronicles 11:18

And Rehoboam took him Mahalath the daughter of Jerimoth the son of David to wife, and Abihail the daughter of Eliab the son of Jesse;

Jubilees

Jubilees 29:18

Esau. For in the days when Jacob went to Mesopotamia, Esau took to himself a wife Mahalath, the daughter of Ishmael, and he gathered together all the flocks of his father and his wives, and went