WinSecWiki > Security Settings > Local Policies > Security Options > Accounts > Rename guest account
Accounts: Rename guest account
An administrator can temporarily override this setting by manually renaming the account, but upon the next application of group policy, Windows will re-rename the account as indicated by this policy – provided Group Policy’s Security policy processing is configured to reapply policies even if they haven’t changed.
This policy DOES affect the built-in Guest domain account in Active Directory if the policy is enabled at the root of the domain in Default Domain Policy. It has no affect if enabled in Default Domain Controllers Policy. This setting only changes the pre-Windows 2000 logon name of the account. The common name remains Guest.
Bottom line
It doesn't hurt to use this to rename Guest but Guest is disabled by default anyway and should stay that way. See Accounts: Guest account status.
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