i made a map of Brazil and recently i duplicated it to make all south america, but the map can't keep with the same name (detailed Brazil). i tried to change the name but i think it is impossible.

If it's not public yet just click the "Edit name or description" button.

If it's already public, e-mail fizzer@warlight.net with a link to the map, the new name, and the reason you want to change the name.

I think he made the new map be in the same map family. Because I don't think there's a way to copy a map to a new map family, except for uploading the svg again, which would mean you lose all connection, bonus and centerpoint info.