וַֽיַּחְפְּרוּ֙ בְּאֵ֣ר אַחֶ֔רֶת וַיָּרִ֖יבוּ גַּם־עָלֶ֑יהָ וַיִּקְרָ֥א שְׁמָ֖הּ שִׂטְנָֽה׃
און זײ האָבן געגראָבן אַן אַנדער ברונעם, און האָבן זיך איבער אים אױך געקריגט. און ער האָט גערופֿן זײַן נאָמען שִׂטנָה.
Radak
ויחפרו...שטנה, from the word “Satan.” The name reflected the fact that every time they dug with success they would be subjected to this hatred.
Chizkuni
ויקרא שמה שטנה, “he named that well: “hatred.” We must not understand the name of this well as reflecting the same sentiments as the previous well he had dug, as at that time the name עשק, “dispute,” reflected that he gave the Philistines the benefit of the doubt when they claimed that the waters that came out of that well had previously flowed in their river. When they disputed his right to the second well, he became convinced that their arguments were malicious and not based on a legitimate claim.