how can a function find the name by which it is called?

[Gribouillis]

these users are not coders and probably have no understanding of a traceback

I had the same problem once with a drawing language that I created for non programming users. The solution that I used was a very strong arguments checking for the commands that those users could call. They virtually could not call the commands with wrong arguments, so that the commands could not fail. This strategy has some limitations too.