Deuteronomy 3:4

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.

וַנִּלְכֹּ֤ד אֶת־כׇּל־עָרָיו֙ בָּעֵ֣ת הַהִ֔וא לֹ֤א הָֽיְתָה֙ קִרְיָ֔ה אֲשֶׁ֥ר לֹא־לָקַ֖חְנוּ מֵֽאִתָּ֑ם שִׁשִּׁ֥ים עִיר֙ כׇּל־חֶ֣בֶל אַרְגֹּ֔ב מַמְלֶ֥כֶת ע֖וֹג בַּבָּשָֽׁן׃

And we took all his cities at that time, there was not a city which we took not from them, sixty cities, all the region of Argov, the kingdom of ῾Og in Bashan.