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How To Change User Name Windows 10
If you're using Windows 10, you may want to change your user name for various reasons. Maybe your name has changed, or you want to personalize your account. Whatever the reason, changing your user ...
The command prompt method won't work, It'll just set your password to newname. I'm pretty sure there is no way to change a username using command prompt except for deleting and recreating an account.
new username