Shemos - Seeds of Moshiach

Why is the book of Exodus also called the book of Names? How do the Names of the tribes relate to the redemption of the Jewish people? Why does Hashem appear to Moshe in a thorn bush? Why didn't Hashem appear in a great Cedar or other majestic tree? What is the difference between the non-Jewish outlook and the Jewish outlook as to where Hashem manifests His Divine Presence? Why did the mothers of Am Yisrael - Rachel and Leah - have to go through such difficult times, as referred to in the names they gave their children? How did these very names manifest later in the redemption?