Excel labels each threaded comment with the name of the person who is currently logged in with their account. This cannot be changed by typing over it. However, notes are different. Excel labels notes by using a name that you specify in the Options dialog box. The following procedure explains how to change the name that appears on notes, not threaded comments.

Click the File tab and then click Options.

In the General category, under Personalize your copy of Microsoft Office, type a name in the User name box.

Notes: 

If the User name box is empty, Excel automatically sets the value of the User name box to your user name, and uses that name for the label.

Although you can’t suppress note labels, you can remove labels from notes by deleting them.