1 Chronicles 3:15

“And the sons of Josiah were, the firstborn Johanan, etc.] Of whom we nowhere else read; he probably died before his father Josiah: the second Jehoiakim: whose name was Eliakim, changed for the former by the king of Egypt, when, he deposed his younger brother, and set him on the throne, (<122324>2 Kings 23:24) the third Zedekiah; whose name was Mattaniah, but changed by the king of Babylon, when he placed him on the throne in the room of his brother’s son, (<122417>2 Kings 24:17), the fourth Shallum: the same with Jehoahaz, who was first made king in the room of his father; but reigning so short a time, and making so mean a figure, is mentioned last, (see <242211>Jeremiah 22:11).”

“Zedekiah--called the son of Josiah (compare Jer 1:3; Jer 37:1), but in Ch2 36:19 he is described as the brother of Jehoiachin, who was the son of Jehoiakim, and consequently the grandson of Josiah. Words expressive of affinity or relationship are used with great latitude in the Hebrew. Shallum--No king of this name is mentioned in the history of Josiah's sons (2Ki. 14:1-29; 2Ki. 23:1-37), but there is a notice of Shallum the son of Josiah (Jer 22:11), who reigned in the stead of his father, and who is generally supposed to be Jehoahaz, a younger son, here called the fourth, of Josiah.”

“Of the sons of Josiah, Johanan, “the first-born,” who is mentioned in this place only, must, it would seem, have died before his father, or with him at Megiddo; and Shallum (also called Jehoahaz, marginal note and reference) was considerably older than Zedekiah, and was consequently the third, and not the fourth, son. He is perhaps assigned the fourth place here by way of intentional degradation. Compare Jeremiah 22:10-12; Ezekiel 19:3-4. return to 'Top of Page'”

“Shallum - Which most conceive to be the same who is called Jehoahaz, Kg2 23:30. 1 Chronicles 3:16”

“3:15 Three of the four sons of Josiah served as kings of Judah.”