Your Sunkenland server takes its name from the active world's folder. That folder also contains a GUID, which is the long ID the startup command line uses to find the save. You'll be changing the name before ~ and leaving that ID alone, so the server still loads the same world.
- Back up your server and stop it before changing the save files.
- Open File Manager, or connect by FTP, and go to
/saves/Worlds/. - Find the folder with the same GUID as your startup command line. There may be several worlds here, so use the GUID to identify the active one.
- Rename the part before
~. For example, to change LogicServers to DeepSeaAdventures:LogicServers~f9cb9058-6722-457f-9f35-2e7d2bf37107 DeepSeaAdventures~f9cb9058-6722-457f-9f35-2e7d2bf37107
The first line is the old folder name and the second is the new one. Keep~and everything after it exactly as they were; you don't need to change the GUID in the command line. - Start the server again. The new name should now appear in Sunkenland's server list.