Charles Ellicott Commentary 2 Chronicles 28:7

"And Zichri, a mighty man of Ephraim, slew Maaseiah the king`s son, and Azrikam the ruler of the house, and Elkanah that was next to the king." — 2 Chronicles 28:7 (ASV)

Maaseiah the king’s son —that is, a prince of the royal house, related to Ahaz, but not his own son; or he would have been too young to be engaged in the battle. (Compare to 2 Chronicles 18:25: “Joash the king’s son.”)

Azrikam the governor of the house —that is, of the royal house, or palace. Azrikam was nagîd, “prince” or superintendent of the palace, a high court official. (Compare to 1 Kings 4:6; 1 Kings 18:3.)

Elkanah ... next to the king. Elkanah was grand vizier. (Compare to 1 Samuel 23:17; Esther 10:3.) The writer mentions the deaths of these three personages, because of their intimate connection with Ahaz, whose punishment he is describing. The blow which struck them struck the king. (Compare to 2 Chronicles 24:23.)