Watchtower puts forth the argument that you can't really know God unless you know and use the appellation "Jehovah" or its equivalent in other languages. Is this really true? I say it's not true and I will demonstrate to you why.
God's name is not a mere label that we have to use to communicate with him so that he knows we're talking to him. God can read hearts and will know that a worshiper is addressing him even if that worshiper does not use a form of the word "Jehovah". For example, the gospels show that Jesus never directly addressed God in prayer with the name "Jehovah". He always addressed him as "Father". So one does not need to use the name "Jehovah" for God to know that he is addressing Him.
Also, it is often not necessary to use "Jehovah" to distinguish him from other gods when conversing with others about which god you worship. Unlike ancient times when polytheism was rampant and worshipers of "Jehovah" were in the minority, the world today has a very high percentage of theists that worship "Jehovah" (the god of the bible) and one often only needs to use the word "God" or say he is christian for others to know which god he worships.
So really, the labeling and distinguishing functions of the name is not as important as JWs make it out to be. So what about the name is important? It has to be the meaning of the name. Since God's name has a descriptive meaning, then God's name is actually a description of who he is. Therefore knowing god's name is really about knowing who god is - his character or nature as described by the meaning of the name. So look at this:
"Jehovah" means "He Causes to Become" and Watchtower says it alludes to the fact that God causes himself or his creations to become whatever he wishes so that his will can be accomplished. Think about that meaning for a while. Can you think of any words or titles that encompasses the meaning of the name? Of course you can! "Creator". Doesn't a creator quite literally cause things to become? What about the term "Almighty" or "All-Powerful"? Do these not also convey the impression of one who has the power to do anything - to cause anyone or anything to become anything he desires? Really, the expression "He Causes to Become" is just a fancy way of saying "He that does things", "He that makes things", "the Prime Causer", "the living God", "the active God" - the God that actually has the power to do things and cause things to happen, unlike the other lifeless idol gods, etc.
Now honestly ask yourself this question: Does a person have to know the word "Jehovah" and it's meaning, in order to know these things about the God of the bible? If a person studied a modern KJV that uses "LORD" and omits "Jehovah", would he not still learn from it that God is Almighty, Creator, Prime Causer? Would he not still learn that God has the power to cause anyone or anything to become whatever desires it or them to become? So you see a person does not have to know the word "Jehovah" to know God's name - to know that God causes to become. For the very name of God is demonstrated by his dealings recorded in the bible. So everyone who is familiar with any bible unavoidably comes to know God's name whether or not the bible contains the word "Jehovah"!
So really, JWs are making a big fuss over the use of a label - the meaning of which is known by virtually all bible-reading christians even without them having to know the actual label, for the whole bible reveals the name of God and so it is foolish to claim that persons don't know God's name, just because they don't know the word "Jehovah". It's shallow, legalistic thinking on the part of the JWs. They focus on telling people to know and use a word when the very persons already know the essence and meaning of that word even without literally knowing the word itself.
So when non-JW christians use titles like "God", "Father" and "Lord", and in their hearts ascribe to these titles the same connotations of "Almighty", "Prime Causer", etc, and think of him as someone who has the power to cause anyone or anything to become whatever he desires - aren't they actually using God's name in their hearts, to the extent that they know the meaning of the name and ascribe it to a label? Think about it.