This blog post shows how to Rename Windows 10 Machine.
The default name is name generated when the Windows 10 installed on the system.
Change Client Computer Name
Open Start menu, click Settings icon to open Settings app
On Settings tab, click System.
Click About to see various information about your PC and Windows 10, including the current name of your PC.
Click the Rename PC button to launch Rename your PC dialog.
Type a new name for your Windows 10 Machine, click Next.
Restart your PC now or later to set the new name as your Windows 10 computer name.
The Machine has been successfully Renamed.