In the King Lists in the books of Genesis and 1 Chronicles Achbor is the father of Baal-hanan, a King of Edom, but is not actually listed as being king himself although some commentaries assume that he was. See Genesis 36:38; 1 Chronicles 1:49.
In the Books of Kings Achbor is one of Josiah's officers, and one of the five men sent to the prophetess Huldah to inquire regarding the book of the law newly discovered in the Temple in Jerusalem (2 Kings 22:12, 14). This Achbor is also called Abdon (2 Chronicles 34:20).
This may be the same Achbor who is mentioned as the father of Elnathan in the Book of Jeremiah 26:20-23, and who lived in the reign of King Jehoiakim of Judah.
Based on an article in Easton's Bible Dictionary (1897)Achbor of Edom
Achbor of Judah