YHWH means I AM. YHVH is the name for GOD.This is from the hebrew. When Moses said "Who shall I say sent me" GOD replied I am who or that I am. He basically was telling Moses he was acting on his behalf.Go look up the words... "I AM THAT I AM" is not the male y+(h-w-h) "to be" with a third person male prefix (the first yod). If I am not mistaken Sh'mot in the fourth aliyah (Exodus 3:1–15) reads "אֶהְיֶה אֲשֶׁר אֶהְיֶה" (pronounced Ehyeh-Asher-Ehyeh and properly translated "I am that I am"). Not "He who is" (roughly the tetragrammaton's proper translation).
Even looking at Wikipedia will cover this. "The Scandal of Divine Presence" by Jrry Martin (Chair Emeratus , Department of Philosophy, University of Colorado at Boulder) published in 2011 at SSRN.COM (and I think available from LSU on-line) provides data and some very good secondary sources.
But I do not think cutting hairs about this serves anyone as wil says. Peace and Silence.