Are there names to avoid when naming tables and other databases?

Yes. Several system tables and databases have default names which you should avoid using as names you assign.

This name	Is the default name of the
USERINFO	User database
MASTER	Library manager database
AFELOG	Entry logging system
WIP	WIP database
APPIDX	Archive index

In many cases, you can override these defaults using INI options, but to avoid any potential confusion or collision, we recommend that you not use these names, except for their expressed purpose.