Concise Bible Dictionary:
Father of Maachah, wife of Rehoboam and mother of Abijam, king of Judah (1 Kings 15:1-2,10). But in 2 Chronicles 11:20 we read that Maachah was the daughter of Absalom; therefore Abishalom appears to be a fuller way of writing Absalom, and refers to the son of David. See ABSALOM.
Jackson’s Dictionary of Scripture Proper Names:
father is peace Ac’cad, only a pitcher
Potts’ Bible Proper Names:
A father’s peace; friendly:― son of David [ABISHALOM], 2 Sam. 13:1. {Patris pax}