Can I change the name of my Island?
It is not possible to change the name, because it represents the subject of the Island. You would not want to join an Island about "Food" to later find out it has changed to "Travels". You can change it only if there was a grammatical error in the original name.
What is the name of an Island?
It is the name of an Island, you need to choose a name according to the topic you wish to discuss in your Island, for example: if you are talking about "chocolate", your name could be named "ChocolateLovers".