No. The domain names are fixed. You can migrate to a new one - see https://confluence.atlassian.com/cloudkb/changing-the-cloud-instance-url-address-or-migrating-to-a-new-cloud-instance-691011835.html
You can also rename your site, but that won't change the url it lives on.
Yes you can. Please see the link below for steps.
https://confluence.atlassian.com/cloud/change-your-application-or-site-name-744721605.html
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