Ah, thanks for the screenshot. That's much better.
So yes, you wanted the change the FriendlyName in this case, in registry.
In Device Manager, right click on one of the disks, go to Properties > Details tab, In the property dropdown box, select "driver key". Then in the value box, you should receive a string of numbers letters.. right click and copy it.
Then launch Registry, go to Computer\HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Enum
Right click on Enum folder on the left, go to Find, the paste that value you copied above to search. Once found, on the right, you should find the FriendlyName, double click on it and change it to whatever you want.
The repeat the steps for the other disk. And then restart your Device Manager and you should see the change.