Albert Barnes Commentary 2 Chronicles 11:20

"And after her he took Maacah the daughter of Absalom; and she bare him Abijah, and Attai, and Ziza, and Shelomith." — 2 Chronicles 11:20 (ASV)

Maachah the daughter of Absalom - Rather, “granddaughter” (see the 1 Kings 15:2 note).