“I am” is the name God calls Himself with. When God sent Moses to the Israelites, Moses asked 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?”
“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.’”” (Exodus 3:13-14)