windows - Can I rename my User folder name?

My logon name is royin and hence , I have an appropriate folder in :

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Can I rename this folder to something else ? ( of course - not just rename , but letting the system know that from now on this is the folder).

Related info :
The real scenario is that I bought a computer with a user named "Admin" and they installed all the soft under this user. and so , I want to change it to royin.

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