It's been my experience that you shouldn't put "simple" or synonyms in the title of a software library. If the project is any good it will grow, and eventually outgrow its simplicity.
After using backbone for a while it really has just gotten in the way more than anything else. You still end up writing a lot of DOM glue and use model data to control the DOM (barf). Live DOM bindings in things like angular / knockout / ember are much better. I wouldn't go back to backbone after using dom binding libraries.