We have seen how to change the username that gets displayed for track changes in Word 2013 & Word 2010. But if you are sharing the word document with track changes and do not want to display the author who did the change then you can remove the information from the document.
To hide the username from track changes, click the File menu then navigate to Info menu.
Click the Check for Issues down arrow and select Inspect Document from the drop down menu list.
In the Document Inspector Window, un tick the check box with label as Document Properties and Personal Information and click the Inspect button.
This would remove “who did the changes” information from the document.