The DayZ developers require the following to be somewhere in the server name.
(Public/3PP:ON/OFF) - [Version Number]
be in that exact format, but it can be anywhere in the name. If it does not exist in the title, it will be automatically pre-appended to the title.
You can have the server name be different, as long as it contains that above information. For example, you could have:
DayZ Chicago - (Public/3PP:ON) - 114008 - My DayZ Server Name
In order to ensure that you are able to use your desired name, we recommend copying your "Server Name" in your Control Panel and modifying it to suit your needs, by adding your custom text before or after the required text.