While I'm sure you're getting downvoted because people think that Linux the kernel has nothing to do with GNU, this isn't quite true: Linux uses the GNU General Public License and at the time of its initial announcement had to compare itself with GNU (and how it wasn't going to be as "professional" as GNU).

While Linus himself nowadays actively speaks out against GNU, he still use GNU's license and GNU's software (gcc and glibc), so even in Linux alone, without the GNU userland, we see some influence of GNU on Android.

The kernel is just Linux. GNU/Linux refers to the combination of the Linux kernel and GNU userland (core libraries and binaries).