Hello!
At the topology builder you can change the name, it is not a requisite, but generally is the most used.
https://social.technet.microsoft.com/Forums/lync/en-US/ceb635b0-348f-4fdc-b26f-6127d97d595b/what-is-my-edge-servers-access-edge-external-interface-fully-qualified-domain-name-fqdn?forum=ocscertificates
https://docs.microsoft.com/en-us/skypeforbusiness/deploy/deploy-edge-server/deploy-edge-server
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