Isaiah 62:4 - Ellicott's Commentary On The Whole Bible

Thou shalt no more be termed Forsaken... — The change of name is here partially indicated, and probably finds its starting-point in the marriage of Hezekiah with Hephzi-bah (2 Kings 21:1), which, on the assumption of Isaiah’s authorship of these Chapter s, would be fresh in the prophet’s memory. It would be entirely after his manner to see in the bride’s name, as in those of his own sons, an omen of the future. The fact that the Hebrew word for Forsaken (Azubah) had been borne by a previous queen, the mother of Jehoshaphat (1 Kings 22:42), confirms the view here taken. “Hephzi-bah” means “my delight is in her;” and “Beulah,” “married.”