Up To Date Guide
http://xcodebook.com/2011/04/renaming-projects/
Change Complete Project Name
Menu > Project > Edit Active Target > Build tab
Select ‘All Configurations’ from Configuration.
Scroll down to the ‘Packaging’ group > Product Name
Double click it and enter the new name.
Build and run and the name has changed.
Change The Displayed Name
Changing the displayed name of the app (for instance if the full app name is too long to fit under the icon)
Open ApName_prefix.plist
Change the ‘Bundle Display Name’ entry.
The default is ‘${PRODUCT_NAME}’, overwrite this with the shorter name to be displayed.