What you want to do that's not a profile name technically, that's called Personalization. Account and profile are pretty much synonyms.
It's set by default as the Owner name of the computer, you can change it in the application options (in MS Office). Procedure varies, but it's generally in a Tools > Options > User Information type menu.
In Windows, you can change the Owner name in this registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion