Mapset Name for each Map Region

i’am using opentopo garminmapes with my old garmin unit 60csx
On enabling and disabling Maps to view on the unit
it says allways Opentop on the mapset name
I am building my own gmapsupp.img with just the Maps i need.
Does someone solved problem
Name of the map:
e.g. 35200152 Bodensee West
e.g 35200148 Freiburg
i can change the title easely with Gmaptool or gmt.
I wonder if there is a list of regionnames to corresponding mapnumbers.
Or a batch file …
Any Ideas?