What is Ehya?

In Exodus 3:13 Moses asks God whom he should say sent him, when the Israelites want to know who is going to free them from slavery to Pharaoh in Egypt? God answers, "Thus shall you say to the Israelites, Ehyeh sent me to you." ...Ehyeh-Asher-Ehyeh...shall be my name forever..., this shall be my appellation for all eternity.

This phrase has been translated as; "I am that I am," "I am who I am," or "I will be what I will be." It evokes the name YHVH.