I saw this speaker talk once about " the name of god " and starting using old testament examples. We are protected by name of god, the name of god is in him, the name traveled to met us. The ark of the conevant is call the name. Etc etc.
What it really means is the essence or power of God. It often just used to refer to God himself. It Hebrew it is called the shema.
It has nothing to do with four letters or just saying a magical word. The jw have reduced the bible to Harry Potter on this issue.