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).
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Fausset, Andrew R. Entry for 'Abihail'. Fausset's Bible Dictionary. https://www.studylight.org/dictionaries/eng/fbd/a/abihail.html. 1949.