Genesis 26:18-21

MLV(i) 18 And Isaac again dug the wells of water, which they had dug in the days of Abraham his father. For the Philistines had stopped them after the death of Abraham. And he called their names after the names by which his father had called them. 19 And Isaac's servants dug in the valley and found there a well of springing water.
20 And the herdsmen of Gerar contended with Isaac's herdsmen, saying, The water is ours. And he called the name of the well Esek, because they contended with him. 21 And they dug another well and they contended for that also. And he called the name of it Sitnah.