Hello. My name is Michael. I can help you with your question.
You cannot change the names on existing comments, but you can prepare the document to make all comments anonymous. To do that, please do the following:
You can save a document without the names or initials of reviewers who are associated with the document.
Please let me know if this does what you need or if you have additional questions.
Open a document that has been saved with comments that you want to make anonymous.
Click the Microsoft Office Button , point to Prepare, and then click Inspect Document.
Click Remove All next to Document Properties and Personal Information.
IMPORTANT Do not click Remove All next to Comments, Revisions, Versions, and Annotations, which will permanently delete all of the comments from the document.
Click Reinspect, and then save the document.
When you reopen the document, all comments that appear in the document will appear without names or initials, but the comments will still be there.