Following the question. The area was the first to fall under the Assyrians with the Jewish citizens being deported in large numbers of others being brought into resettle. So it was no longer Galilee (of the Jews) by of the Gentiles. Thus Ishaiah's calling attention to it. The Hebrew word can be rendered either as "nations" or "Gentiles" as they mean essentially the same thing. Jesus was quoting Isaiah even though by his time it appears that the Jewish population had incresed significantly, outnumbering the Gentiles (other nations not Jewish).
Following the question. The area was the first to fall under the Assyrians with the Jewish citizens being deported in large numbers of others being brought into resettle. So it was no longer Galilee (of the Jews) by of the Gentiles. Thus Ishaiah's calling attention to it. The Hebrew word can be rendered either as "nations" or "Gentiles" as they mean essentially the same thing. Jesus was quoting Isaiah even though by his time it appears that the Jewish population had incresed significantly, outnumbering the Gentiles (other nations not Jewish).