Hezekiah, king of Judah and son of Ahaz, is not named in the Book of Mormon. He enters its text only by way of interpretation: one reading takes the prophecy Nephi quotes from Isaiah at 2 Nephi 19:6 — “For unto us a child is born, unto us a son is given; and the government shall be upon his shoulder; and his name shall be called, Wonderful, Counselor, The Mighty God, The Everlasting Father, The Prince of Peace” — as spoken of Hezekiah’s birth, casting him as a sign of deliverance from Assyria. On this reading the “Immanuel” sign given to Ahaz, “God with us” (2 Nephi 17:14), also points to Hezekiah, grouping him with the two children whose names Isaiah uses as signs: Shear-jashub (2 Nephi 17:3) and Maher-shalal-hash-baz (2 Nephi 18:1-4).
The same titles — Mighty God, Everlasting Father, Prince of Peace (2 Nephi 19:6) — are read in Christian tradition as a prophecy of Christ, so the passage carries a double application: to the salvation of Hezekiah’s people in his own reign, and to the Messiah.