The name you see on the Windows 11 lock screen (e.g., "Welcome, John") is directly tied to your Microsoft account or local user account name. You cannot change the lock screen display name independently without changing the account name itself.

Here are the three methods to change it, depending on the type of account you use. If you log in with a Microsoft email address (e.g., Outlook.com, Hotmail), your lock screen shows your Microsoft account profile name.

By following the correct method for your account type, you’ll have the desired name displayed on your Windows 11 lock screen in just a few minutes.