Oh, dear! Such argument. I think what is needed here is a short (very short!) lesson in the English language. In old English, witchcraft is written as wiccacraft. But this is very misleading as the word wicca means male, wicce. means female. Gardner (and even Crowley before him) thought it would be best to refer to males and females as priest and priestess; to save confusion. Wicca therefore is a very old English word. But it was Gardner and Valiente who really brought into being the name Wicca for the Gardnerian style of modern witchcraft; as opposed to the Alexandrian style taught by Alex Sanders. (From the city of Alexandria, not from the name Alex!)
The original Rede was by Crowley, "Do what thou wilt shall be the whole of the law". It was Gardner (actually Doreen Valiente) who modified this to "An' harm none."
Just as a matter of history, in the handwritten Saxon Scrolls the word is written "uuiccacraft". Literally a double U. When printing was becoming widespread it was held that the letters joined was easier to print, hence the W. Geoffrey Chaucer also used the W in his book The Canterbury Tales. Ah, we learn something everyday, do we not?