Distinguishing between downloaded maps

If I have a number of maps downloaded from this site on my Garmin device (etrex 20) each one is listed there as “OSM Generic Routable”. I can’t distinguish between them. I give them different names when I copy them to my device, and this shows up in Windows Explorer, but on the Garmin device itself this doesn’t show up. Is there any solution to this?

You can use http://www.javawa.nl/jdm_en.html to edit the names.