Can I choose the name of a folder in Launchpad?
Posted as an answer so I can have all the formatting benefits, instead of directly responding to your comment on @mwidmann's answer;

TUAW recently posted a writeup on how to "fix" your Launchpad database when problems begin to occur;


  Removing the database files from the user's Dock application support
  folder and restarting the Dock allows Mission Control and the
  Launchpad to re-build the database from scratch, updating the
  presentation with all the new applications.
  
  Here are HaiTeq's steps, with a few modifications on my part for
  safety. Admittedly, if you are not comfortable at the command line,
  this is not the hack for you.
  
  
  Launch Terminal: /Applications/Utilities/Terminal.app
  Navigate to the Application Support folder in question: cd ~/Library/Application\ Support/Dock
  Open the folder (open .) and drag all the .db files to the trash.
  Restart Dock: sudo killall Dock, and authenticate when the dialog prompts you for your username/password.
  


Source