John Gill

And Josias begat Jechonias,.... This Jechonias is the same with Jehoiakim, the son of Josias, called so by Pharaohnecho, when he made him king, whose name before was Eliakim, Kg2 23:34 begat of Zebudah, the daughter of Pedaiah of Rumah, Kg2 23:36. and his brethren. These were Johanan, Zedekiah, and Shallum. Two of them were kings, one reigned before him, viz. Shallum, who is called Jehoahaz, Kg2 23:30 compared with Jer 22:11, the other, viz. Zedekiah, called before Mattaniah, reigned after his son Jehoiakim: these being both kings, is the reason why his brethren are mentioned; as well as to distinguish him from Jechonias in the next verse; who does not appear to have had any brethren: these were about the time they were carried away to Babylon, which is not to be connected with the word "begat": for Josiah did not beget Jeconiah and his brethren at that time, for he had been dead some years before; nor with Jechonias, for he never was carried away into Babylon, but died in Judea, and slept with his fathers, Kg2 24:6 but with the phrase "his brethren": and may be rendered thus, supposing understood, "which were at", or "about the carrying away to Babylon", or the Babylonish captivity.