Considering that jws feel they are the only one making God name's known and his kingdom and they never mention either. If you look at the "recommended" presentations, it is always "God" not Jehovah and maybe around Christmas they mention Jesus or the kingdom. Here's the only presentation where it suggests saying you are a jw.
*** rs p. 20 How You Might Respond to Potential Conversation Stoppers ***‘I’m sorry that I caught you at an inconvenient moment. As you may know, I am one of Jehovah’s Witnesses. I wanted to share with you an important thought from the Bible. But since you don’t have time to listen right now, I would like to give you this tract, which discusses (name the subject). It won’t take long to read, but you will find it very interesting.’
Only in telephone witnessing are jws told to identify themselves as such.
*** km 7/90 p. 4 par. 6 Presenting the Good News—By Telephone *** If the person asks, "Whom do you represent?" simply say without pausing, "I am one of Jehovah’s Witnesses, and I am calling to invite your opinion on this interesting question. Have you ever wondered . . . ?"
But notice here they play the game:
*** km 11/85 pp. 4-5 par. 23 Meeting the Challenge of Apartment Witnessing ***Before answering the door, many people will look through the peephole to see who is knocking. If you detect this, what can you do? One sister experienced in apartment witnessing stated: "Look directly at the peephole and immediately say a warm greeting." This lets the householder know that you know he is there. If the householder asks, "Who is it?" you can simply give your name and that of your companion. If this does not succeed in getting the householder to open the door, then identify yourself as one of Jehovah’s Witnesses.