Israel (Heb.). The Eastern Kabbalists derive the name from Isaral or Asar, the Sun-God. “Isra-el” signifies “striving with god”: the “sun rising upon Jacob-Israel ” means the Sun-god Isaral (or Isar-el) striving with, and to fecundate matter, which has power with “God and with man” and often prevails over both. Esau, Æsaou, Asu, is also the Sun. Esau and Jacob, the allegorical twins, are the emblems of the ever struggling dual principle in nature—good and evil, darkness and sunlight, and the “ Lord” (Jehovah) is their antetype. Jacob-Israel is the feminine principle of Esau, as Abel is that of Cain, both Cain and Esau being the male principle. Hence, like Malach-Iho, the “Lord” Esau fights with Jacob and prevails not. In Genesis xxxii. the God-Sun first strives with Jacob, breaks his thigh (a phallic symbol) and yet is defeated by his terrestrial type—matter; and the Sun-God rises on Jacob and his thigh in covenant. All these biblical personages, their “Lord God” included, are types represented in an allegorical sequence. They are types of Life and Death, Good and Evil, Light and Darkness, of Matter and Spirit in their synthesis, all these being under their contrasted aspects.
Source: H.P.Blavatsky - The Theosophical Glossary