You can rename your server by editing your server config file.
You can edit your server config file by clicking on the button "Edit Server Config" or
Editing the file located \ShooterGame\Saved\Config\WindowsServer\GameUserSettings.ini
Look for this line. Edit it save it and restart your server.
[SessionSettings]
SessionName=[AU] ClanHost.com.au Servers
If you do not see this line, you will need to add it or your server name will end up something like ARK#123456
Still not working??????? Then you can try this............
Editing the file located \ShooterGame\Config\DefaultGameUserSettings.ini
And add this to the bottom of the file.
[SessionSettings]
SessionName=[AU] [CLUSTER] ClanHost.com.au Servers
Now restart your server.