When creating new source files xcode adds comments with your name and company name.
Where do I set my company name for xcode (not the project).
There's more confusion about this than there should be. I clarified here: https://stackoverflow.com/a/9793899/1273966 I'll do the same in this thread.
If the organisation name is blank in the project document (described above) the company name is pulled from the 'me' entry in your address book.
If you enter an organisation name in the project document as described above, it will override the company name in the address book. IE: You can override your company name on a per project basis. Pretty clever, but obviously has a lot of people confused.