jpw1692 interesting that Shaw also mentions Rastafarians and the Sacred Name movement, along with JWs, to illustrate modern diversity of use of the divine name, comparing it with diversity in ancient times.
Also if JWs are right about the divine name, I'd suggest that the closely related issues surrounding the Trinity and the nature of God are likely to be correct as well.
As JWs never tire of pointing out, names do change in translation, including the name Jesus. This does not make the use of the name in other languages somehow invalid.
Londo111
While there are a few copies of the Septuagint where YHWH was used
Not just a few copies, but in fact every single surviving pre-Christian copy that preserves text including the divine name uses a form of the name rather than Lord.
there is no positive proof that YHWH appeared in the New Testament or that early Christian groups used the divine name. There is conjecture and guesswork by some scholars, but that is not positive evidence that firmly establishes it.
It's not conclusive at this point but it's better than guesswork, and the evidence is mounting. Plus other scholars suggest that Kyrios, written in full, was original, whereas the earliest copies contain nomina sacra abbreviated forms. So whichever form is original - YHWH, Iao, or Kyrios - the original form does not appear in the earliest NT fragments that survive.
cobweb, lemonjuice and steve2 some argue for three syllables, like Nehemiah Gordon, but pronunciation can vary for names over time and in different languages.