Adriel
Easton's Dictionary
Flock of God, the son of Barzillai, the Meholathite, to whom Saul gave in marriage his daughter Merab (1 Sam. 18:19). The five sons that sprang from this union were put to death by the Gibeonites (2 Sam. 21:8, 9. Here it is said that Michal “brought up” [R.V., “bare”] these five sons, either that she treated them as if she had been their own mother, or that for “Michal” we should read “Merab,” as in 1 Sam. 18:19).
Smith's Dictionary
International Standard Bible Encyclopedia
a'-dri-el (`adhri'el, "my help is God"): The son of Barzillai the Meholathite, to whom Merab the daughter of King Saul was married when she should have been given to David (1Sa 18:19; 2Sa 21:8). "Michal" in 2Sa 21:8 is a textual error easily accounted for Adriel and Merab had five sons, whom David handed over to the blood vengeance of the men of Gibeon. The name Adriel seems to be Aramaic, the equivalent of the Hebrew name Azriel.