Is it possible to change the name of an app which is already in the windows 8 store through an update ? I can imagine that the actual name can be changed through the manifest file but what about the name in the store ?
Here is an guide on MSDN about the things you have to do to change the name of your app: http://msdn.microsoft.com/en-us/library/windows/apps/hh868182.aspx
Tried it myself and it works like a charm!