בֵּ֤ן פֹּרָת֙ יוֹסֵ֔ף בֵּ֥ן פֹּרָ֖ת עֲלֵי־עָ֑יִן בָּנ֕וֹת צָעֲדָ֖ה עֲלֵי־שֽׁוּר׃
אַ פֿרוכטיק בײמל איז יוֹסף, אַ פֿרוכטיק בײמל בײַ אַ קװאַל; די צװײַגן שפּרײַזן איבער דער מױער.
Rashi
בן פרת means a graceful son. It is an expression used in Aramaic: אפרין נמטיה “Let us treat gracefully (literally, let us make a triumphal procession for) R. Simeon”, and may be found at the end of Bava Metzia 119a.
Chizkuni
בן פורת יוסף, also a variant of the word ענפים, “branches.” Joseph is viewed as the son whose branches grow profusely as if planted along abundant waters.
Da'at Zekenim
בן פורת יוסף, “the land allocated to the tribe of Joseph is fruitful as a tree planted near a well of water.”