No, you will have to create a new account (i had a case with Atlassian support about the same thing). I do however think there is a way to export your instance, create a new cloud account in the right name and simply import it, but you are better off talking to support.atlassian.com on best practices.
See https://confluence.atlassian.com/cloudkb/changing-the-cloud-instance-url-address-or-migrating-to-a-new-cloud-instance-691011835.html - fully documented. Sadly, it's a new-server-export-import, but it can be done
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