While I agree that GNU software makes up an important part of a Linux system, I do not see a reason to include it in the name – doing so with every important part of my computer would result in the short and easily pronounceable name Opera/Pidgin/Claws-Mail/Xfce/Debian GNU/Linux. Or something like that.

So I really think that it is perfectly fine to name a system by it’s lowest possible encapsulated unit of software (kernel). In my case, this is Linux.