Some few Israelites were left after their captivity, who joined themselves to the kingdom of Judah, and were carried captive to Babylon with them, from whence also they returned with them, as we find in the history of their return in Ezra and Nehemiah.
Related Commentaries of Isaiah 17:6
Isaiah 17:6
6 Yet gleaning grapes shall be left in it, as the shaking of an olive tree, two or three berries in the top of the uppermost bough, four or five in the outmost fruitful branches thereof, saith the LORD God of Israel.