If you work in a large organization or use a computer that someone else controls, you might end up with a user name that doesn't make much sense to you, that isn't easily recognizable, or that you just don't like. Follow the steps below to create a friendly user name. You'll see the friendly user name displayed on the Welcome screen and on your Start menu.
If you are connected to a domain, Group Policy settings might prevent you from completing these steps.
The steps that you should follow will vary, depending on whether your computer is on a domain or a workgroup. To find out, see "To check if your computer is on a workgroup or domain" in What is the difference between a domain, a workgroup, and a homegroup?
Type the new name, and then click Change Name.
You can't change the name of the guest account.
A user name cannot be longer than 20 characters, consist entirely of periods or spaces, or contain any of these characters: \ / " [ ] : | < > + = ; , ? * @
Click the account that you want to change, and then click Properties.
Type the new name, and then click OK.
A user name can't be longer than 20 characters, consist entirely of periods or spaces, or contain any of these characters: \ / " [ ] : | < > + = ; , ? * @