How to set an arena map display name

[Dimedo]

All the custom maps are listed with their BSP file names in the Arena Mode map selection. How can I give them an overlay name aka display name so that they look like the originals?

An entity?
A secret list file somewhere in the GCF mystery land?
No possibility?
Valve doesn't allow us to say?
Some other crap?

[Xenogenetic]

Go to Map Properties, it's in there.