“Mahalath” means stringed instrument

Mahalath: the daughter of Ishmael, and one of the wives of Esau. (Genesis 28:9)

one of the eighteen wives of King Rehoboam, apparently his first. (2 Chronicles 11:18) only. She was her husband's cousin, being the daughter of King David's son Jerimoth.

the title of p, 53, and Mahalath-leannoth, the title of Ps. 88. The meaning of these words is uncertain. The conjecture is that mahalath is a guitar, and that leannoth has reference to the character of the psalm, and might be rendered "to humble or afflict," in which sense the root occurs in ver. 7.