וְהֵפִ֧יץ יְהוָ֛ה אֶתְכֶ֖ם בָּעַמִּ֑ים וְנִשְׁאַרְתֶּם֙ מְתֵ֣י מִסְפָּ֔ר בַּגּוֹיִ֕ם אֲשֶׁ֨ר יְנַהֵ֧ג יְהוָ֛ה אֶתְכֶ֖ם שָֽׁמָּה׃
Yang Mahakekal akan menyerakkan kamu di antara bangsa-bangsa, dan hanya sedikit dari kamu yang akan tersisa di tengah bangsa-bangsa ke mana Yang Mahakekal akan menggiring kamu.
Ramban
AND YE SHALL BE LEFT FEW IN NUMBER. He is stating that we will be left as a minority among any of the nations whereto G-d will lead us, for He will scatter us as the four winds of the heaven,94Zechariah 2:10. but in our totality we are many [i.e., Israel will remain a large nation, but because of our dispersion we are in a minority in each of the many countries] — praise be to G-d [that in our totality we are many]!
Tur HaArokh
ונשארתם מתי מספר, “and you will be left few in number.” This is not a reference to the total number of Jews, but a prediction that due to the dispersal of the people in the Diaspora, each host country will have only a small number of Jews. If a census were to be taken of all the Jews in all the various countries, they would still amount to a sizable number.