The Meaning of Yahweh's Name
Although God's Name was known to mankind since its creation, it came to be mixed in with the other names of supposed deities that man began to worship in Yahweh's place.
God made a covenant with Abraham, and Abraham built altars unto Yahweh and called upon the Name of Yahweh at them. His children swore by the Name of Yahweh. Yet even in this, his descendents eventually lost this Name as the primary appellation of the Creator. They did not understand its meaning, nor to place their trust in it.
As God determined to fulfill His promise to Jacob, He raised up Moses to deliver Israel into their promised land. To do this, Moses asked for God to identify Himself with a Name that he could take back to the children of Israel.
13Moses said to God, “Behold, when I come to the children of Israel, and tell them, ‘The God of your fathers has sent me to you;’ and they ask me, ‘What is his name?’ What should I tell them?” Exodus 3:13
The Lord answered Moses succintly, giving him an insight into His very own nature.
14God said to Moses, “I AM WHO I AM,” and he said, “You shall tell the children of Israel this: ‘I AM has sent me to you.’” Exodus 3:14
In Hebrew, it was:
אהיה אשר אהיה - "I am what I am"
God's very nature and appellation was existence. He was what He was and could be nothing else. He was not god of the seas, or of the heavens, or of the earth, or of the hills or valleys; He was simply Being.
If the Israelis understood and trusted this when Moses brought the message, they would have faced no doubts as they met the resistance of Pharaoh and the Egyptians.
God then puts this Name into the third person as He gives Moses His eternal memorial:
15God said moreover to Moses, “You shall tell the children of Israel this, ‘Yahweh, the 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 forever, and this is my memorial to all generations. Exodus 3:15
יהוה - "He Is"
This is the third person form, using an older form of the verb "to be", as אהיה is in the first person, using a more recent form of "to be" in Moses' time.
As God declares Himself by Himself, He speaks His Name in the first person. As He gives it to creation to speak of Him, He gives it in the third person.
In addition, there is also evidence that both of these forms may be in the causative stem, which would give them an additional relevatory nature: God is the One Who causes existence, the source of being.
This full revelation of what God's Name represented was the beginning of a journey for God's people. As they continued to face adversity, they would continue to understand that Yahweh—because He was Existence itself—had power and authority over all things at all times.
In the Name of Yahweh we find that God simply Is. Our existence and all that we know and experience is due to His Being.
28‘For in him we live, and move, and have our being.’ As some of your own poets have said, ‘For we are also his offspring.’ Acts 17:28
Discerning Yahweh
This is perhaps the foundation of our faith in God—knowing that He is.
Once we realize that nothing is possible without Him, including our own existence, we are able to take the next step to choosing to live in and for Him every moment—just as we were created to do!