The Tetagrammaton 4 hebrew letters representing Gods name in the Hebrew scriptures as JHVH or more likely YHWH .
The name Jehovah was unheard of before the 13th Century simply because no one beforehand had added vowels to those four Hebrew consonants representing Gods name .
And then comes along a Spanish Catholic Monk of the 13th Century that adds vowels to those 4 Hebrew consonants and he comes up with the name Jehovah.
A name that the Catholic Church has used in and on Churches since the 13th Century throughout Europe and elsewhere in the world.
And lo and behold the G.B.of Jehovah`s Witnesses in their wisdom stated in the first edition of the "Aid To Bible Understanding" that they chose the name Jehovah as the correct pronunciation of Gods name because it was the most popular name in use in the world ?
By whom might I ask ?
Logically by Christendom `s religions ,who else ?
Then their is the Bible Cannon that all of the major christian religions have different books that they feel should make up the Bible.
They could be just some of the religions that have different books making up the Bible .
However Jehovah`s witnesses have clung to the traditional Protestant view of what books should make up the Bible ignoring the fact that some books of the bible themselves quote passages from other books that Christendom never included in the Bible cannon.
The book of Enoch
The book of Jubilees
The testament of Jonah
The book of Jasher
First and second Maccabees
Just to mention a few .
Not to mention the Books incuded in the Bibles mentioned previously ,that are not contained in the NWT Bibles.