No. For example, in this text Elohim is YHWH and Moses.
So Moses went down unto the people, and spake unto them.
And God spake all these words, saying,
I [am] the LORD thy God, which have brought thee out of the land of Egypt, out of the house of bondage.
Exodus 19:25-20:2, KJV
So Mosheh went down unto the people, and spake unto them.
And Elohim spake all these words, saying,
I [am] YHWH Elohyk, which have brought thee out of the land of Egypt, out of the house of bondage.
Elohim = אלהים (plural)
Elohyk = אלהיך (singular)
Yes. Christianity conflates the two, eg YHWH from Joel with Jesus Christ of Nazareth.
And it shall come to pass, [that] whosoever shall call on the name of the Lord shall be saved.
Acts 2:21
For David is not ascended into the heavens: but he saith himself, The LORD said unto my Lord, Sit thou on my right hand,
Until I make thy foes thy footstool.
Therefore let all the house of Israel know assuredly, that God hath made that same Jesus, whom ye have crucified, both Lord and Christ.
Acts 2:34-36
Be it known unto you all, and to all the people of Israel, that by the name of Jesus Christ of Nazareth, whom ye crucified, whom God raised from the dead, [even] by him doth this man stand here before you whole.
This is the stone which was set at nought of you builders, which is become the head of the corner.
Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved.
Acts 4:10-12
Also from Paul:
For to this end Christ both died, and rose, and revived, that he might be Lord both of the dead and living.
But why dost thou judge thy brother? or why dost thou set at nought thy brother? for we shall all stand before the judgment seat of Christ.
For it is written, [As] I live, saith the Lord, every knee shall bow to me, and every tongue shall confess to God.
Romans 14:9-11
I have sworn by myself, the word is gone out of my mouth [in] righteousness, and shall not return, That unto me every knee shall bow, every tongue shall swear.
Isaiah 45:23