The king's, the father of Jerahmeel, mentioned in Jer. 36:26. Some take this word as a common noun, "the king", and understand that Jerahmeel was Jehoiakim's son. Probably, however, it is to be taken as a proper name.
a king; a counselor ...
Hitchcock's Bible Names Dictionary
lit. "the king, " unnecessarily rendered in the Authorized Version as a proper name. (Jeremiah 36:26...
William Smith's Bible Dictionary