Follow the style:

<vendor-name>-<device-name>.ini

Since all Device Description INI files get installed into a single directory (refer CAPS Printer Driver Database Directory) it is important to avoid file name clashes.

Let the <device-name> part be as precise as possible. If there are Printer800a and Printer800c printer model variants available (and they differ in their USB data as well), please create two individual INI files acme-printer800a.ini and acme-printer800c.ini even if both printers share the same driver.