Boyd’s Bible Dictionary:

(afflicted by God). (1) Wicked wife of Jehorom, king of Judah, who introduced the worship of Baal and was slain by her own guards (2 Kings 11; 2 Chron. 22-24). (2) A Benjamite (1 Chron. 8:26). (3) Head of a returned Jewish family (Ezra 8:7).

Concise Bible Dictionary:

1. Descendant of Benjamin (1 Chron. 8:26).
2. Father of Jeshaiah who returned from exile (Ezra 8:7).
3. Daughter of Jezebel and Ahab, and granddaughter of Omri (compare 2 Kings 8:26 with 2 Kings 8:18), wife of Jehoram king of Judah. She may be said to have introduced the worship of Baal into Judah, and she brought up her son to follow in her evil ways (2 Chron. 22:3). He having been slain by Jehu when he was executing judgment on the house of Ahab, Athaliah usurped the throne and endeavored to destroy all the seed royal. One child, Joash, was concealed in the temple, and after Athaliah had reigned six years, he was anointed king and crowned; Athaliah was taken outside the enclosures of the temple and slain (B.C. 878). The temple and idol of Baal were at once destroyed, and the priest slain. The history is a solemn instance of the danger of an unholy alliance (2 Kings 11:1-20; 2 Chron. 23:12-21).

Strong’s Dictionary of Hebrew Words:

or mAthalyahuw {ath-al-yaw'-hoo}; from the same as 6270 and 3050; Jah has constrained; Athaljah, the name of an Israelitess and two Israelites
KJV Usage:

Jackson’s Dictionary of Scripture Proper Names:

due season for Jah

Potts’ Bible Proper Names:

The Lord took away; Jah has constrained:―the name of an Israelitess and two Israelites [ATHLAI], 1 Chron. 8:26. {Abstulit Dominus}