וַנִּלְכֹּ֤ד אֶת־כָּל־עָרָיו֙ בָּעֵ֣ת הַהִ֔וא לֹ֤א הָֽיְתָה֙ קִרְיָ֔ה אֲשֶׁ֥ר לֹא־לָקַ֖חְנוּ מֵֽאִתָּ֑ם שִׁשִּׁ֥ים עִיר֙ כָּל־חֶ֣בֶל אַרְגֹּ֔ב מַמְלֶ֥כֶת ע֖וֹג בַּבָּשָֽׁן׃
И мы взяли все его города в то время; не было города, который мы взяли не у них; шестьдесят городов, весь район Аргоб, царство Ог в Башане.
Rashi
חבל ארגב [ALL] THE LINE OF ARGOB — We render this in the Targum by בית פלך טרכונא Now I have seen that the Jerusalem Targum of the Scroll of Esther terms a palace טרכונין. I learn from this that חבל ארגב signifies “the province of the Royal Palace”, denoting that the province is called after its name (after the name of the palace). Similarly, also the term ארגוב found in the Book of Kings (2 15:25) where the meaning is that Pekah the son of Remaliah slew Pekahia the son of Menahem near the king’s palace (את ארגוב), I learn that thus (after the palace) was the province named.
Ibn Ezra
the Argov group The words of the Aramaic translator [“royal cities”] are well-known. Others say that Argov is the name of a man whose patrimony contained this group. Still others assert that the ’alef is extraneous, and that the word is distantly related to “the clouds [Hebrew: regavim] cleave fast together” [Job 38: 38].
Rashbam
ארגוב, the meaning of this word depends on the context in which the word appears.