Thank you for posting a question on Atlassian Community. We are happy to help you. See if my answer below is able to make things more clear :)
In general it should be possible to change the name (URL) but it is not something that you can easily do on UI (yet!). Basically it requires contacting support team directly and they would check if this is possible.
Please take a look on this KB that is fully explaining the topic
Make sure you also look at the specific Jira tickets included in the KB above and watch/vote on them.
I hope it would be more clear after reading it. However if not please hit a reply button to my answer (so that we would continue the thread) and we can continue to troubleshoot.
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