They have made up shit from the very beginning.
They are fixated on being God's one true religion........... this is what their brand is all about................so they can't sound like any other Christian religion. Nor believe what others believe. They have to put their own spin on everything they could.
That's what the name Jehovah is all about. It separates them. That's also what minimizing Jesus is all about because every other Christian religion puts Jesus first or co existing with the father.
(They branded themselves with a name that was entirely made up). a Latinization of the Hebrew יְהֹוָה, one vocalization of the Tetragrammaton יהוה (YHWH), one of the seven proper names of the God of Israel in the Hebrew Bible.
The consensus among scholars is that the historical vocalization of the Tetragrammaton at the time of the redaction of the Torah (6th century BCE) is most likely Yahweh.
The problem is that the Jewish alphabet has no J. So our historic Jesus the anointed one would have been called Yeshua HaMashiach?
Somehow or another they managed to use a made up name for God and new cultist names that they use to set themselves apart.