Genesis 26:20

And the herdmen of Gerar did strive with Isaac's herdmen
About the well which was dug in the valley; and this shows it was near Gerar or at least was upon the border of the country, and so it was a disputable point to whom it belonged: saying, the water [is] ours;
though the well was dug by Isaac's servants, yet they laid claim to the water, pretending it was their ground, being on their borders: and he called the name of the well Esek:
which signifies "contention": the reason of the name follows, because they strove with him;
wrangled, contended, and disputed with him about whose right it was.