וַיִּתְּנ֨וּ לָהֶ֜ם אֶת־קִרְיַת֩ אַרְבַּ֨ע אֲבִ֧י הָֽעֲנ֛וֹק הִ֥יא חֶבְר֖וֹן בְּהַ֣ר יְהוּדָ֑ה וְאֶת־מִגְרָשֶׁ֖הָ סְבִיבֹתֶֽיהָ׃
И дали им Кириаф-Арбу, Арба был отцом Анака.—то же самое Хеврон—в холмистой местности Иудейской вокруг вокруг.
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.