Allel, as pointed out, the Name WAS in the OT scriptures quoted in the NT, which HAD no word for Jehovah/Yahweh.
THAT is why the first Septugiants had it written in Hebrew text .
Since it EXISTS in ENGLISH, we put it back.
Think the Christians writing the NT REMOVED the very Name Jesus taught them to HONOR?
We don't. There simply wasn't a Greek equivalent, yet- that came later.