The Tetragrammaton (יהוה) is the personal, covenant name of the God of Israel — the name he chose to reveal himself to Moses at the burning bush and by which he entered into binding relationship with his people. When Moses asks God for his name, God answers: "I AM WHO I AM" — Ehyeh asher ehyeh (אֶהְיֶה אֲשֶׁר אֶהְיֶה) — and then instructs Moses to say "the LORD [YHWH] has sent me" (Exodus 3:14–15). The name YHWH is derived from the Hebrew verb hayah (to be, to exist) and declares God's essential, self-existent, eternal being — he is the one who simply IS. He depends on nothing; he is beholden to nothing; he is the ground of all being. More than abstract philosophy, YHWH is a relational name — the name of the God who makes and keeps covenants. He declares it as his "name forever," the "name by which I am to be remembered throughout all generations" (Exodus 3:15). When Christ declares "Before Abraham was, I AM" (John 8:58), he invokes this very name — claiming the divine identity that the crowd understood immediately and for which they reached for stones.
JEHOVAH, n. The Scripture name of the Supreme Being; a Hebrew word signifying existence, or the existing, self-existent being. It is from HWH, the same in signification as HYH, to be, and with the prefix Y. It is the incommunicable name of God, and is considered as a more holy and sacred word than the other Hebrew names of the Supreme Being — so much so that the Jews scrupled to pronounce it, and substituted Adonai (Lord) in reading.
• Exodus 3:14–15 — "God said to Moses, 'I AM WHO I AM'… 'Say this to the people of Israel: "The LORD has sent me to you." This is my name forever.'"
• Exodus 6:3 — "I appeared to Abraham, to Isaac, and to Jacob, as God Almighty, but by my name the LORD I did not make myself known to them."
• Psalm 83:18 — "That they may know that you alone, whose name is the LORD, are the Most High over all the earth."
• Isaiah 42:8 — "I am the LORD; that is my name; my glory I give to no other."
• John 8:58 — "Jesus said to them, 'Truly, truly, I say to you, before Abraham was, I am.'"
The Tetragrammaton has been treated carelessly in three ways. First, by false familiarity: reducing God's holy covenant name to a casual "Yahweh" in contemporary worship songs strips the awe that ancient Israel rightly felt before this name. The prohibition was not superstition — it reflected the weight of encountering the self-existent, covenant-keeping God. Second, by Watchtower overreach: the Jehovah's Witnesses have inserted "Jehovah" (a hybrid of YHWH's consonants and Adonai's vowels, coined in the 13th century) into the NT hundreds of times where the Greek clearly reads Kyrios (Lord) — applied to Jesus. This is textual manipulation. Third, by modern translation suppression: most translations render YHWH as "LORD" (small capitals) throughout the OT, which obscures how often the personal name appears. Readers lose the intimacy of God's self-disclosure: he is not just "the Lord" — he is YHWH, the I AM, the one who made a covenant with Abraham and kept it through Christ.
H3068 — יְהוָה (YHWH): The personal covenant name of God — "I AM," the self-existent eternal One; appears 6,828 times in the OT
H1961 — הָיָה (hayah): "to be, to exist, to become" — the root verb from which YHWH is derived, expressing God's eternal self-existence
G2962 — κύριος (Kyrios): "Lord" — the LXX substitute for YHWH; applied to Jesus throughout the NT, affirming his deity