In Genesis 19:24, it appears in the sense of the letter, as if there were two Jehovahs: one on earth, and one in heaven. When Jehovah is first named it refers to the Lord's divine human, and the second time the essential divine or the father.

(Odkazy: Arcana Coelestia 2447)

54. We can now see from this that Jehovah, who is the Lord from eternity, spoke through the prophets and that where it speaks of the Holy Spirit, it is he himself.

Therefore, God is one in person and in essence, and he is the Lord.