וַֽיְהִי־ל֞וֹ שְׁלֹשִׁ֣ים בָּנִ֗ים רֹֽכְבִים֙ עַל־שְׁלֹשִׁ֣ים עֲיָרִ֔ים וּשְׁלֹשִׁ֥ים עֲיָרִ֖ים לָהֶ֑ם לָהֶ֞ם יִקְרְא֣וּ ׀ חַוֺּ֣ת יָאִ֗יר עַ֚ד הַיּ֣וֹם הַזֶּ֔ה אֲשֶׁ֖ר בְּאֶ֥רֶץ הַגִּלְעָֽד׃
Rashi on Judges
Thoroughbreds.עוּלִין,1This is Targum Yonasan’s translation. the choicest horses.
Rashi on Judges
They owned thirty towns. They owned thirty unwalled municipalities. This is why they are described as עַיָרִים, "towns", meaning the same as עַיָירָוֹת.2Rather than עָרִים meaning walled cities.