SP+livelong

http://dictionary.reference.com/browse/livelong

This definition says that it is dreary to have a name and that people who have names use them all the time when they don't need to. In the context, it sounds like she doesn't like this. This is why she is a nobody.

This link is confusing: you linked 'livelong' and this doesn't really respond to it. Not sure what you mean by 'people who have names' using them constantly? Be sure to proofread for clarity.