I was reading the Bart's answer to Terry on th name "Jehovah", and I remembered that when I did my personal study about the Church Fathers of the second century I found that Justin Martyr ignored the divine name:
From the First Apology of Justin Martyr:
... and as many virtues as are peculiar to a God who is called by no proper name. (Chapter 10)
For no one can utter the name of the ineffable God; and if any one dare to say that there is a name, he raves with a hopeless madness. (Chapter 61)
Justin lived during the first half of the second century, so he knew no NT manuscript containing the name YHWH. And by other Justing's readings I concluded that he only knew, the OT Greek version, the Septuagint, in which you find "Kurios" (Lord) instead of YHWH.
So, Justin was a bad "Jehovah's witness". :)