51 Saul’s father Kish and Abner’s father Ner were sons of Abiel.
1 Samuel 14:51 Cross References - BSB
1 Samuel 9:1
1 Now there was a Benjamite, a powerful man, whose name was Kish son of Abiel, the son of Zeror, the son of Becorath, the son of Aphiah of Benjamin.
1 Samuel 9:21
21 Saul replied, “Am I not a Benjamite from the smallest tribe of Israel, and is not my clan the least of all the clans of Benjamin? So why would you say such a thing to me?”