Whenever you log-in to Windows 10, your name appears above the password entry. What if you want to change your name? This post addresses this issue.
Whether you use a local account or a Microsoft Account, it’s relative easy to change your display name.
This is for Windows 10 devices

Changing Your Display Name for a Microsoft Account
To change you name for a Microsoft Account, you need to open your account preferences on the Microsoft website.
Opens the Settings app by pressing the Windows key+I or type in Settings in the Cortana search field, then click the Settings app at top of the screen. Then click on the Accounts option. Refer to below image:

Below your name and photo, click on Manage my Microsoft account. See following image:

Signin to your Microsoft Account if not already signed. This will open your account preferences in your browser. After your browser opens, click the More Actions drop-down box, then click on Edit Profile from the options list. See below image:

Below your name, click Edit Name. Refer to below image:

Enter your first and last name, solve the CAPTCHA challenge, then click Save to update your name. See following image:

When your Profile page reloads, it will update with the name change.
Note! When you change your Microsoft Account name, it changes on all devices that you use to log-in with this account.
For your new name to show on your Windows 10 log-in screen, you will have to log out of Windows 10. Be sure to save any unsaved work or applications before signing out.
Changing Your Display Name for a Local Account
A local account is a basic approach in using Windows 10. Local accounts don’t have the added features like syncing files, settings, browser history, etc. across multiple devices.
If you want to change your local account name, fire up the Control Panel. In the Cortana search box, type in Control Panel then click on the Control Panel app at the top of the screen.
Next click on the User Accounts option. Refer to below image:

Now click on User Accounts one more time. See below image:

Now, select Change your account name option to change your log-in name. See following image:

Note: If an organization manages your device or you don’t have administrator privileges, you won’t be able to change your name.
Enter the new log-in name into the text field, then click the Change Name button to save your changes. Refer to below image:

You are done and may now close the Control Panel window. For your new name to show on your Windows 10 log-in screen, you will have to log out of Windows 10. Be sure to save any unsaved work or applications before signing out.
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