God reveals His nature through His names. The Old Testament names — YHWH, Elohim, El Shaddai, Adonai, and the compound Jehovah names — reveal God’s character, power, and covenant relationship.
The New Testament reveals the supreme name of God: Jesus. In Jesus Christ, all the fullness of God’s nature and all the meaning of God’s names are fully revealed.
To know the name of Jesus is to know the one true God.