Genesis 26:17-21

So Isaac moved away from there and encamped in the Valley of Gerar, where he settled. Isaac reopened the wells that had been dug in the time of his father Abraham, which the Philistines had stopped up after Abraham died, and he gave them the same names his father had given them. Isaac’s servants dug in the valley and discovered a well of fresh water there. But the herders of Gerar quarreled with those of Isaac and said, “The water is ours!” So he named the well Esek, because they disputed with him. Then they dug another well, but they quarreled over that one also; so he named it Sitnah.