Welcome to the forum Deut18: 20-22
,You only have to look at the "Aid" book where they acknowledge that the name Jehovah is not the correct pronunciation of his name and that Yahweh may be closer to what the Tetragrammaton represents .
However because the name "Jehovah" is/was the most popular name used in Christendom they chose to be identified by that name .?
Haven`t they always said that Christendom tried to hide the name of GOD from there members ?
And not to be overlooked is the origin of the name Jehovah ,a Spanish Catholic Monk of the 13th century named Raymundus Martinus or the like.
Thank you for your research , much appreciated .