This reminds me of a discussion I once had with an elder regarding whether it would be more fitting to use "Michael" instead of Jesus since the person who was Jesus was Jesus (Yeshua aka Joshua) in earthly life, but that in (current) JW theology he is now Michael in heaven and the time period that the Bible speaks of his activity, that is how he is known (again in current JW theology).
He saw my point and said that if I privately did that it would be ok, but not to do that from the platform in prayer or whatever as it would possibly stumble others.
Then about a week or so later, he showed the the scripture "in the name of Jesus, every one shall bend their knee" or whatever and said that it thus indicated that only THAT name was fitting to be used as a reference to Jesus in prayer, etc.
I think the point of the matter is that such things as this and the Yahweh/Jehovah discussion stress the rigid literalism that Jehovah's Witnesses possess at times and goes to show how the religion can sometimes be distanced from the real value or spiritual heart of the matter.
While it may be true as JWs say, that it seems to be more proper to use a "personal" name if we want a relationship with God or Christ and conducive to intimacy, one must be careful not to be overly dogmatic about it and recognize that you can use a person's name as much as you want but if your relationship is actually strained because of other reasons it is not going to help you to be any closer to that person. And conversely if you have an extremely harmonious and intimate relationship with someone, it is possible to go for extended periods of time without even whispering that person's name.
-Eduardo