|Easton's Bible Dictionary|
(1.) A priest of Baal, slain before his altar during the reformation under Jehoiada (2 Kings 11:18).
(2.) The son of Eleazar, and father of Jacob, who was the father of Joseph, the husband of the Virgin Mary (Matthew 1:15).
(3.) The father of Shephatiah (Jeremiah 38:1).
Int. Standard Bible Encyclopedia
mat'-an (mattan, "a gift"):
(1) A priest in the house of Baal, slain by Jehoiada before Baal's altar (2 Kings 11:18 2 Chronicles 23:17).
(2) The father of Shephatiah a contemporary and persecutor of Jeremiah (Jeremiah 38:1), one of those who put Jeremiah into Malechiah's dungeon (38:6).
Mattan (3 Occurrences)
2 Kings 11:18 All the people of the land went to the house of Baal, and broke it down; his altars and his images broke they in pieces thoroughly, and killed Mattan the priest of Baal before the altars. The priest appointed officers over the house of Yahweh. (WEB KJV JPS ASV BBE DBY WBS YLT NAS RSV NIV)
2 Chronicles 23:17 All the people went to the house of Baal, and broke it down, and broke his altars and his images in pieces, and killed Mattan the priest of Baal before the altars. (WEB KJV JPS ASV BBE DBY WBS YLT NAS RSV NIV)
Jeremiah 38:1 Shephatiah the son of Mattan, and Gedaliah the son of Pashhur, and Jucal the son of Shelemiah, and Pashhur the son of Malchijah, heard the words that Jeremiah spoke to all the people, saying, (WEB KJV JPS ASV BBE DBY WBS YLT NAS RSV NIV)