It was against the law for the Jews to speak or write the Lord’s name except for one day each year when they spoke it 7 times in a Temple ceremony called Yom Kippur, the Day of Atonement.
When they wrote His name they used 4 initials to represent it. They were translated into English as JHVH. The King James translators put LORD, all in caps, where the initials appeared in the Hebrew text.
But the truth is no one alive today knows God’s actual name. After the Temple was destroyed, the Yom Kippur ceremony changed and they no longer spoke it. Scholars estimate it was eventually lost in about 300 AD. Today Jesus is the name above all names (Phil. 2:9-11).
Click HERE to read about Yom Kippur.