Some ideas for the new stdlib class:

BasicEnum - This helps emphasize that it is a simpler version of Enum that doesn't support all of the Enum features (like assigning values). It also helps communicate that if you don't need values this is a better fit.

AutoEnum - This new version (compared with AutoNumberEnum in the docs) does more than just auto number, since it does even the value assignment. Auto helps communicate that this is automatically creating much of the class internals for you.