Who was Saul's father?

Answer: Kish

Kish was a powerful Benjamite. His son Saul was handsome and taller than anyone else among the Israelites.

“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. And he had a son named Saul, choice and handsome, without equal among the Israelites—a head taller than any of the people.”— 1 Samuel 9:1-2 (BSB)