Occasionally, CUPS will magically choose a printer name for you that you didn't specify and don't like, and then not give you the option to change it. Fortunately, you can fix this by editing the config file:
sudo vi /etc/cups/printers.conf
Locate the offending line, eg:
<Printer Printing_Protocol>
...
</Printer>
...and change it to something more palatable:
<Printer Canon-i960>
...
</Printer>
Restart CUPS:
/etc/init.d/cupsys restart