The sons of Jeconiah - Jeremiah has said ( Jeremiah 22:30;) that Jeconiah, or, as he calls him, Coniah, should be childless; but this must refer to his posterity being deprived of the throne, and indeed thus the prophet interprets it himself: For no man of his seed shall prosper, sitting upon the throne of David, and ruling any more in Judah.
Assir - Salathiel was not the son of Assir, but of Jeconiah, Matthew 1:12. Who then was Assir? Possibly nobody; for as the Hebrew אסר assir signifies a prisoner, it may be considered as an epithet of Jeconiah, who we know was a very long time prisoner in Babylon. See 2 Kings 24:15; and Calmet.
Assir - Perhaps born in the captivity, and therefore so named, who either (died young, or was made a eunuch (Isaiah 39:7; compare Jeremiah 22:30). After Assir‘s decease, or mutilation, the line of Solomon became extinct, and according to the principles of the Jewish law Numbers 27:8-11 the inheritance passed to the next of kin, who were Salathiel and his brethren, descendants from David by the line of Nathan. Luke in calling Salathiel “the son of Neri” Luke 3:27, gives his real, or natural, descent; since no genealogy would assign to the true son and heir of a king any inferior and private parentage. Hence, “Malchiram,” etc., i. e. not Salathiel only, but his brothers also were reckoned “sons” of Jeconiah.