That name "Jehovah" rattles my cage too. The name doesn't belong in the Greek seeing as the Tetragrammaton or the 4 letters have no equivalent in Greek. So for them to put that name in the Greek is a travesty.
18 I warn everyone who hears the words of the prophecy of this scroll: If anyone adds anything to them, God will add to that person the plagues described in this scroll.
Revelation 22:18 | NIV