What is the meaning of "Azkir Rahav u'Vavel l'Yod'ai"?
Rashi: Also this they said about you (Yerushalayim) - I will remind Egypt 1 and Bavel about Jews [in their lands, that they should bring them to Yerushalayim - "v'Hevi'u Es Kol Acheichem mi'Kol ha'Goyim Minchah la'Shem" (Yeshayah 66:20).
Rashi (5): I will mention to My nation and to those who know Me the greatness of Egypt and Bavel, that now, they see their greatness - Peleshes, Tzor and Kush, because they are near them, all other nations aggrandize them, and say 'this was born there, in Egypt or Bavel.'
Radak #1: When I mention the great countries of Goyim to those who know [the attribute of Tziyon], I do not see among them like Tziyon. "L'Yod'ai" is like l'Yod'im, just like "v'Kara Lo Chalonai" (Yirmeyah 22:14) is like Chalonim.
Radak #2: The suffix Yud in l'Yod'ai is a pronoun; it refers to Tziyon (those who know me, Tziyon).
Radak #3: The suffix Yud in l'Yod'ai refers to the author - those who know Tziyon like I do.
Radak (7, from Shocher Tov): In the future, the Goyim will bring gifts to Melech ha'Mashi'ach - Jews born in their lands.
Malbim: If I mention a nation like Egypt or Bavel, I mention only the nation. If an individual is missing, his lost is not felt.
Radak: Also "ha'Machtzeves Rahav" (Yeshayah 51:9) refers to Egypt.
What does the verse teach about Peleshes, Tzor and Kush?
Rashi: Also they are like Egypt and Bavel - they should be aware to seek and remember everyone [born in Yerushalayim 1 ].
Rashi (5): Refer to 87:4:1:2.
Malbim: Also they are like Egypt or Bavel (if an individual is missing, his loss is not felt).
I.e. so they will bring the Jews there to Yerushalayim, like Egypt and Bavel will. (PF)
What is the meaning of "Zeh Yulad Sham"?
Rashi: This is from the families born in Tziyon - "v'Atem Teluketu l'Achad Echad" (Yeshayah 27:12).
Rashi (5): Refer to 87:4:1:2.
Radak: In all these countries, if there is a Chacham, it is a rare occurrence, and they will say as a praise 'this Chacham was born here' (as opposed to Tziyon - refer to 87:5:1).
Malbim: For other nations, we do not mention individuals, rather, the nation was born there.