Rename User Account on Windows 10
Ways to Change User Name of Account in Windows 10
There are 6 different ways to complete this as indicated in the Windows 10: Change User Name of Account in Windows 10 post but I will reference one of those that should work well for all versions of Windows 10 whether Home, Pro, Enterprise, etc. but see that post for other ways to do this.
To Change Name of a Local Account in netplwiz
Press the Win+R keys to open the Run dialog, type netplwiz into Run, and click/tap on OK to open netplwiz.
Check the Users must enter a user name and password to use this computer box, select the local account you want to change the name of, and click/tap on the Properties button. (see screenshot below)
In the General tab, type the new User name (ex: "Brink3") you want for the local account, and click/tap on OK. (see screenshot below)
If you wanted to have Windows automatically sign in to an account at startup, then you will need to set this up again now.
When finished, click/tap on OK. (see screenshot below)
If you are currently signed in to this local account, click/tap on Yes to sign out and apply your changes.
source
Further Resources
- Windows 10: Change User Name of Account in Windows 10
- 3 Ways to Change User Account Name in Windows 10
- 6 Ways to Change User Account Name in Windows 10
Since I don't have enough reputation to comment on @pimp-juice-it 's answer, I'll just say it here. Renaming your user account this way is very risky. Once you sign out, your old password won't work, requiring you to use the Administrator's account to bypass the login window e.g. in such instances: https://www.howtogeek.com/222262/how-to-reset-your-forgotten-password-in-windows-10/ & https://www.ghacks.net/2019/01/07/how-to-reset-windows-10-account-passwords/
But you might be aware, after exploring the above links, that most of those examples are quite dated. Adding to the harsh truth that your Windows version is a much later edition i.e. 1809, 1903 ... these hacks might barely work. So I'm appealing to anyone who visits this page looking to change their username (most likely to remove spaces) that they should really take caution. If you must go ahead, just back up your files.