Genesis 26:17-20

17So Isaac left that place and encamped in the Valley of Gerar and settled there. 18Isaac reopened the wells that had been dug in the days of his father Abraham, which the Philistines had stopped up after Abraham died. And he gave these wells the same names his father had given them.

19Then Isaac’s servants dug in the valley and found a well of fresh water1 there. 20But the herdsmen of Gerar quarreled with Isaac’s herdsmen and said, “The water is ours!” So he named the well Esek,2 because they contended with him.