וַתַּ֣הַר עוֹד֮ וַתֵּ֣לֶד בֵּן֒ וַתֹּ֗אמֶר עַתָּ֤ה הַפַּ֙עַם֙ יִלָּוֶ֤ה אִישִׁי֙ אֵלַ֔י כִּֽי־יָלַ֥דְתִּי ל֖וֹ שְׁלֹשָׁ֣ה בָנִ֑ים עַל־כֵּ֥ן קָרָֽא־שְׁמ֖וֹ לֵוִֽי׃
און זי איז װידער טראָגעדיק געװאָרן, און האָט געבאָרן אַ זון, און זי האָט געזאָגט: אַצונד דאָס מאָל װעט מײַן מאַן װערן צוגעטאָן צו מיר, װײַל איך האָב אים געבאָרן דרײַ זין; דרום האָט מען גערופֿן זײַן נאָמען לֵוִי.
Rashi
הפעם ילוה אישי THIS TIME WILL MY HUSBAND BECOME ATTACHED TO ME — Because the Matriarchs were prophetesses and knew that twelve tribes would issue from Jacob and that he would have four wives, she said, “From now he will have no fault to find with me, for I have assumed my full share in giving him children” (Midrash Tanchuma, Vayetzei 9).
Chizkuni
ילוה אישי אלי, “my husband will be more firmly connected to me.” She meant that up until now she would take her two children one with each hand, and did not need to call on her husband’s support. Now she needed to call on his support as she could not take three children by her two hands.
Rashbam
על כן קרא שמו לוי, one may assume that it was Yaakov who gave the boy this name. (compare Kimchi)
Rabbeinu Bahya
צוטריטלעך נאָר פֿאַר פּרעמיום־מיטגלידערSiftei Chakhamim
צוטריטלעך נאָר פֿאַר פּרעמיום־מיטגלידערRashi
על כן THEREFORE — Wherever in the case of the names given to Jacob’s sons the word “therefore” is used, that tribe had a numerous population (Genesis Rabbah 71:4), Levi forming an exception, because the Ark decimated them.