If you feel that GNU belongs in the name, I would say that it should be last since, with this subsystem, you need Windows up and running before you can even insert any GNU tools. So, Windows/GNU or more precisely: Windows + GNU.
However, you could enable the subsystem without installing any GNU tools at all if you wanted to. Then you could install whatever alternative tools that you wish to. Also, I don't think that the OS name should change when I install a set of applications. For instance, when I install Paint.NET to do all of my image work, I don't refer to Windows as Paint.NET/Windows.
However, you could enable the subsystem without installing any GNU tools at all if you wanted to. Then you could install whatever alternative tools that you wish to. Also, I don't think that the OS name should change when I install a set of applications. For instance, when I install Paint.NET to do all of my image work, I don't refer to Windows as Paint.NET/Windows.