1)
Who says "b'Tzeis Izvonayich?"?
1.
Rashi: This is what they will lament over you.
2)
What is the meaning of "b'Tzeis Izvonayich mi'Yamim Hisbat"?
1.
Radak: When your merchandise used to go out on the seas, you satiated many nations. From what came from you, who dwell in the sea, you satiated many and made them rich.
2.
Malbim: The merchandise that was of others, that merchants left by you, and from there it went out to all ends of the land, it satiated many nations. They bought all the merchandise via you through your great wealth and what was given to you for collateral for your merchandise. This made all the kings wealthy!