You can have the book file name be anything you want.
In calibre, after connecting your device, right-click on the device icon and choose "Configure this device". You will see a screen similar to the attachment. Put whatever template you want in the box pointed at by the red arrow.
See the
template language documentation for help with templates. My guess is that you want to use the re() function to remove characters from the authors and titles.
Do note that you must delete the copy with the old file name before sending a copy with the new name, otherwise the new file name will be ignored. The best approach is to connect, delete books using calibre's device view, disconnect, connect again, send. Try it on a few books before you do it for all.