There are different ways to find your computer’s name on Windows.
An easy way would be to right click on This PC/My Computer icon and Click on Properties, there you should be able to see your System info which Computer name is a part of it:
Another way is to go to Control Panel / System and Security and open the same SYSTEM file for checking the System info.
This is also possible using the Windows Command Prompt. Click on Start Menu and type CMD then click on the CMD icon, in the new opened window type hostname and hit enter. This will return your computer name as below: