I was trying to find out from people who can read the original Bible about the original name of God in the Hebrew Bible which they told me its Yahweh before any translation. They say it is a name that was revealed to Moses. How about this now? Did God not say his name was Yahweh to Moses? Did He say his name was Jehovah?

The answer to your question is extremely technical and involves an understanding of the Hebrew language and tradition, the English, German, and Hebrew alphabets, and the motives and spiritual condition of the men who questioned (Genesis 3:1Now the serpent was more subtil than any beast of the field which the LORD God had made. And he said unto the woman, Yea, hath God said, Ye shall not eat of every tree of the garden?
See All...) the usage of Jehovah in the Bible. I won’t attempt to go into the complexities of the arguments as it would take 50 pages or more to thoroughly answer the question.

The people that told you that Yahweh is the correct pronunciation of God’s name may have been ignorant of these arguments. Many people assume (and that is dangerous) that these German scholars were correct without considering their motives and the differences between the sounds of the English letters and the German letters of the alphabet. The name of God that is in question here is often referred to as the tetragrammaton. That is due to the fact that there are four Hebrew letters that make up this name. Depending upon which side of the argument you are on, those letters correspond to the English letters JHVH or YHVH. The problem, J versus Y, arose by mixing the sounds of the German letters with the sounds of the English letters. A German pronounces the letter j like we pronounce our letter y. But the letter j is the correct letter for both German and English. If we are to change the Tetragrammaton to YHVH, we should also change the spelling of Jerusalem to Yerusalem, Jericho to Yericho, etc. In addition, if Yahweh were the correct spelling of the Tetragrammaton, a German would pronounce that w like our v, which moves it closer to what the Bible says, Jehovah. So all of this is a strange mixture of German and English pronunciation designed to make folks ask, “Yea, hath God said…?” (Genesis 3:1Now the serpent was more subtil than any beast of the field which the LORD God had made. And he said unto the woman, Yea, hath God said, Ye shall not eat of every tree of the garden?
See All...). In addition, it creates confusion among God’s people. 1 Corinthians 14:11Therefore if I know not the meaning of the voice, I shall be unto him that speaketh a barbarian, and he that speaketh shall be a barbarian unto me.
See All... says, “For God is not the author of confusion, but of peace, as in all churches of the saints.”

Again, the real problem is that by changing the pronunciation of the Tetragrammaton to Yahweh, it associates the God of the Old Testament with pagan gods in the area of the nation of Israel. That allows the enemies of God and His word to assume that He is nothing more than a tribal god with no real power. A number of websites exploit that error to their own destruction.

Finally, the word Jehovah has exactly 7 letters. Seven, in the Bible, is the number of God’s perfection. Not only that, but the word Jehovah occurs exactly 7 times in the word of God (Genesis 22:14And Abraham called the name of that place Jehovahjireh: as it is said to this day, In the mount of the LORD it shall be seen.
See All..., Exodus 6:3And I appeared unto Abraham, unto Isaac, and unto Jacob, by the name of God Almighty, but by my name JEHOVAH was I not known to them.
See All..., Exodus 17:15And Moses built an altar, and called the name of it Jehovahnissi:
See All..., Judges 6:24Then Gideon built an altar there unto the LORD, and called it Jehovahshalom: unto this day it is yet in Ophrah of the Abiezrites.
See All..., Psalm 83:18That men may know that thou, whose name alone is JEHOVAH, art the most high over all the earth.
See All..., Isaiah 12:2Behold, God is my salvation; I will trust, and not be afraid: for the LORD JEHOVAH is my strength and my song; he also is become my salvation.
See All..., and Isaiah 26:4Trust ye in the LORD for ever: for in the LORD JEHOVAH is everlasting strength:
See All...). The word Yahweh has 6 letters which in the Bible is associated with man. That leaves me with the impression that man has tampered with God’s perfect name. On that point alone, I would be very leery about using Yahweh instead of Jehovah.