The super key (sometimes called the windows, command, or logo key), represented by the java.awt.event.KeyEvent.VK_WINDOWS constant is by the library assigned the same string as the Meta key.
The meta key does not exist on (most) modern keyboards and is thus sometimes mapped to the super key (for those who really need the meta key). However, they are still distinct keys to the operating system and to the JVM.
As for the name, I propose "Super" since it is not device/OS specific and widely used. For example in X11 all all software based on xkbcommon