'Heir' in the Bible

Therefore thus says the Lord concerning Jehoiakim king of Judah, “He shall have no heir to sit on the throne of David, and his dead body shall be thrown out to the heat of the day and to the frost of the night.

Concerning the sons (descendants) of Ammon.Thus says the Lord:“Does Israel have no sons [to reclaim Gad from the Ammonites]?Has he no heir?Why then has Malcam taken possession of GadAnd [why do] his people live in the cities [of Gad]?