וַיִּתְּנ֨וּ לָהֶ֜ם אֶת־קִרְיַת֩ אַרְבַּ֨ע אֲבִ֧י הָֽעֲנ֛וֹק הִ֥יא חֶבְר֖וֹן בְּהַ֣ר יְהוּדָ֑ה וְאֶת־מִגְרָשֶׁ֖הָ סְבִיבֹתֶֽיהָ׃
On leur donna donc la Cité d’Arba (père d’Anok), appelée aussi Hébron, dans la montagne de Juda, avec la banlieue d’alentour.
Radak
בקרית ארבע, Arba was the name of a man whose was known by this “nickname” as he had three sons, and they, just as he himself were giants, so that there were four giants. Compare Joshua 21,11. His three sons were called ששי,חימן, תלמי.