Exodus 3:13-14
13 Moses said to God, "Suppose I go to the Israelites and say to them, 'The God of your fathers has sent me to you,' and they ask me, 'What is his name?' Then what shall I tell them?"
14 God said to Moses, "I am who I am." This is what you are to say to the Israelites: 'I AM has sent me to you.' "
God revealed His name to Moses, "I AM WHO I AM"
God told Moses that I AM or Yahweh is the God of the Israelites.
Allah just means "the god", it is certainly a derivative from Al-Illah.