By default, Xcode inserts a company name something similar to the following in all new source files (.m .h etc):
Copyright (c) 2009 MyCompanyName. All rights reserved.
Changing this reference is as simple as entering the following from within a terminal window, replacing “YourNameHere” with the text you prefer. Also, make sure this is all entered on one line in the terminal
defaults write com.apple.Xcode PBXCustomTemplateMacroDefinitions
Otherwise you can also set the company name in your me card in Address Book.