What is God's true name?
 The ancient Hebrew Israelites knew the Most High God's name but forgot it. So they began to use other names to call on the Most High God.
Jer.23:26-27. How long shall there be in the mouth of the false prophets, prophecies of lies? prophecies of the deceit of their own heart? Who think to cause my people to forget my name by their dreams which they tell every man to his neighbor, as their fathers forgot my name and served Baal. 
Hebrew Israelites scattered around the world, come learn the Most High God's name with clarity and without doubt.
 The ancient Hebrew Israelites were in slavery and bondage in the land of Egypt. The Most High God called on a man name Moses he would use to bring the Israelites out of slavery and bondage. The Most High God told Moses. You must return to Egypt and bring my people out of slavery and bondage, out of Egypt. Notice what Moses said and asked the Most High God.
Exo.3:13-14. And Moses said to God, Behold, when I go to the children of Israel and say to them, The God of your fathers has sent me to you; and they shall say to me, What is his name? what shall I say to them? And God said to Moses, I AM THAT I AM; and he said, Thus you shall say to the children of Israel: I AM has sent me unto you. And God said moreover to Moses, Thus shall you say to the children of Israel: The Lord God of your fathers, the God of Abraham, the God of Isaac, and the God of Jacob, has sent me to you; this is my name for ever, and this is my memorial to all generations.
ISA.40:4 Who has prepared and done it, calling the generations from the beginning?  I the Lord, the first and the last; I AM he.
ISA.41:10 Fear not, for I AM with you; be not dismayed, for I AM your God; I have strengthened you, and have also helped you, yea, I will also uphold you with the right hand of my righteousness.
ISA.41:13-14 For I AM the LORD your God, the strengthener of your right hand. I have said to you, Fear not; I AM your helper. Fear not, O you helpless men of Jacob, O you remnant of Israel!
I AM your Saviour, the Holy One of Israel.
ISA.42:8 I AM the LORD; that is my name; and my glory will I not give to another, neither my praise to graven images.
Remember, that the Most High God told Moses that his name is I AM .
ISA.43:3-6 For I AM the LORD your God the Holy One of Israel, your Saviour; I gave Egypt for your sake, and Ethiopia and Sheba for you. Because you are precious in my sight, you have been honorable and I have loved you; therefore I have given men for your sake and nations for your life. Fear not; for I AM with you; I will bring your descendants from the east, and gather you from the west; I will say to the north, give up; and to the south, Keep not back; bring my sons from afar, and my daughters from the ends of the earth.
Vs.10, You are my witnesses, says the LORD, and my servants whom I have chosen; that you may know and believe me and understand that I AM he; before me there was no God created, neither shall there be after me.
Vs.11, I, even I, am the LORD; and besides me there is no God. Vs.12-13, I have declared that I have saved, and I have proclaimed that there is no strange god among you; therefore you are my witnesses, says the LORD, that I AM God. Yea, from the first day I AM he; and there is none that can deliver out of my hands; what I will do, who can stop it?
Vs.15, I AM the LORD, your Holy One, the Creator of Israel, your King.
Remember, the Most High God told Moses that his name is I AM.
ISA.44:6-8, Thus says the LORD the King of Israel, and his Saviour, the LORD of host: I AM the first and I AM the last; and besides me there is no God. Vs.7, And who is like me? Let him announce it and set it in order and declare it, since I placed the people on the earth for ever. And let them show the wonders that are coming. Vs.8, Fear not, neither be alarmed; have not I announced to you from former time, and have declared it? You are my witnesses, that there is no God besides me, and no mighty one whom I do not know. Vs.24, Thus says the LORD, who saved you and who formed you from the womb and helped you: I AM the LORD who made all things; who stretched out the heavens alone; who spread out the earth by myself.
ISA.45:5-6, I AM the LORD, and there is none else; there is no God besides me; I have girded you, though you have not known me. That they may know from the rising of the sun and from the west that there is none besides me; I AM the LORD, and there is none else. Vs.18, For thus says the LORD who created the heavens ( he is the God who formed the earth and made it; he has established it; he did not create it in vain, but that his creation might dwell in it ) : I AM the LORD; and there is none else. Vs.22, Draw near to me and be saved, all the ends of the earth; for I AM the LORD, and there is none else.
Remember, the Most High God told Moses that his name is I AM .
There is no other God. The one and only true God. His name is I AM .
ISA.46:9, Remember the former things of old; for I AM God, and there is no other God; and there is none like me.
ISA.48:12 & 17, Hearken to me, O Jacob and Israel, whom I called; I AM he; I AM the first, I also am the last. Vs.17, Thus says the LORD, your Saviour, the Holy One of Israel: I AM the LORD your God who teaches you not to do wrong, who leads you by the way that you should go.
ISA.49:23, And kings shall be your foster fathers, and their queens your nursing mothers; they shall bow down to you with their faces to the ground andf shall lick the dust off your feet; and you shall know that I AM the LORD; for they who wait for me shall not be ashamed.
Pay close attention to the next verses.
ISA.52:5-6, Now therefore, what have I here, says the LORD, that my people have been carried away for nought? Their rulers make them to wail, says the LORD; and my name continually all the day is blasphemed. Vs.6, Therefore my people shall know my name in that day; for it is I who spoke; behold, it is I .
The Most High God. His name is I or I AM . They are one and the same.
Remember the Most High God told Moses that his name is I AM.
He told Moses to go to the children of Israel and say, I AM sent me unto you.
ISA.57:11, And of whom have you been in dread and fear, that you have lied against me and have not remembered me nor laid it to your heart? Behold, I AM the Holy One of old, and you did not revere me.