יַ֤פְתְּ אֱלֹהִים֙ לְיֶ֔פֶת וְיִשְׁכֹּ֖ן בְּאָֽהֳלֵי־שֵׁ֑ם וִיהִ֥י כְנַ֖עַן עֶ֥בֶד לָֽמוֹ׃
하나님이 야벳을 창대케하사 셈의 장막에 거하게 하시고 가나안은 그의 종이 되게 하시기를 원하노라 하였더라
Rashi
יפת אלהים ליפת MAY GOD ENLARGE JAPHETH — The Targum renders the verb by יפתי meaning, “may He extend”.
Chizkuni
יפת, “May He expand;” Noach did not use the name of the Lord additionally when blessing Yephet as he had done in connection with Shem’s blessing, as the latter was a righteous person.
Sforno
באהלי שם, (the plural mode) is a reference to Torah academies in addition to the Temple.