וַיָּ֨שָׁב יִצְחָ֜ק וַיַּחְפֹּ֣ר ׀ אֶת־בְּאֵרֹ֣ת הַמַּ֗יִם אֲשֶׁ֤ר חָֽפְרוּ֙ בִּימֵי֙ אַבְרָהָ֣ם אָבִ֔יו וַיְסַתְּמ֣וּם פְּלִשְׁתִּ֔ים אַחֲרֵ֖י מ֣וֹת אַבְרָהָ֑ם וַיִּקְרָ֤א לָהֶן֙ שֵׁמ֔וֹת כַּשֵּׁמֹ֕ת אֲשֶׁר־קָרָ֥א לָהֶ֖ן אָבִֽיו׃
Lalu Ishak kembali menggali sumur-sumur air yang telah digali pada zaman Abraham, ayahnya, yang telah ditutup oleh orang Filistin sesudah Abraham mati; dan ia menamai sumur-sumur itu dengan nama-nama yang sama seperti yang diberikan oleh ayahnya.
Rashi
וישב ויחפר AND ISAAC DIGGED AGAIN — those wells which they had dug in the days of his father Abraham and which the Philistines had stopped up before Isaac left Gerar he once again dug.
Chizkuni
כשמות אשר קרא להן אביו, “as had been their names when his father had named them.” He wished to draw attention to the fact that the success of these wells had been and continued to be due to the merit of his father. In order to prove that this was so, when he left the vicinity of Avimelech’s capital and settled where Avraham had lived for a while and [demonstrated that the success depended not on the quality of the earth and the skill of its farmers, but on the goodwill enjoyed by them in the heavenly spheres and] based on this he concluded a treaty with Avimelech.
Rashbam
אשר קרא להן אביו, in order to prevent anyone in the future to challenge the ownership of the wells.