וְחֶ֤בֶר הַקֵּינִי֙ נִפְרָ֣ד מִקַּ֔יִן מִבְּנֵ֥י חֹבָ֖ב חֹתֵ֣ן מֹשֶׁ֑ה וַיֵּ֣ט אָהֳל֔וֹ עַד־אֵל֥וֹן בצענים [בְּצַעֲנַנִּ֖ים] אֲשֶׁ֥ר אֶת־קֶֽדֶשׁ׃
און חֶבֿר דער קֵיני האָט זיך געהאַט אָפּגעשײדט פֿון קַין, פֿון די קינדער פֿון חובֿבֿ, משהס שװער, און האָט אױפֿגעשטעלט זײַן געצעלט ביז אֵלון-בצענַנים װאָס לעבן קֶדש.
Rashi
Elon Betza'anayim. The marshland plain.8This is Targum Yonasan’s rendition. A plateau area with marshes, "mariscum", "morass" in old French. This is called אַגָנַיָא—pools, similar to ditches where water settles, "entitled 'the earth's flasks.'"9Kiddushin, 61:a, notes that water filed ditches are entitled אַגׇּנֵי דּֽאַרְעָא, “the earth’s flasks.” Thus, אַגָנַיׇא, “flasks,” refer to the marshland pools.
Radak
Separated: It is vocalized with a kamatz. The explanation is that he separated from the Judean Desert, as the Children of the Kenites had settled there when they went up from the City of Dates.
Metzudat David
Separated from Kayin: He separated himself from the rest of the Sons of Kayin who dwelt in the Judean Desert, as it stated at the beginning of the book (Judges 1:16).