Abihail in Fausset's Bible Dictionary

(("father of splendor".) 1. Wife of Rehoboam, king of Judah, daughter, i.e. descendant of Eliab, David's oldest brother. But Keil argues that 2 Chronicles 11:19-20 shows that in 2 Chronicles 11:18 only one wife is named; therefore the sense is "Mahalath the daughter of Jerimoth son of David and of Abihail" (the daughter of Eliab, etc.) 2. Numbers 3:35. 3. 1 Chronicles 2:23. 4. 1 Chronicles 5:14. 5. Father of Queen Esther, and uncle of Mordecai (Esther 2:15).

Link: https://bible-history.com/faussets/A/Abihail/