You really haven't been paying attention have you? There is only one server and one server only. It is divided into shards (zones) as needed. You can have any name you want, even if someone else has it since the name of your toon is always:
toon name@your account name
You can hide the @toon name in your chat if you don't want to see it but it's always there. There is already some supergroup where all the characters have the same name.