Hello Nathan.
Those are internal names, the public access to the servers should be in your company/project domain.
You can see more about it here https://success.outsystems.com/Documentation/11/Setup_and_maintain_your_OutSystems_infrastructure/Setting_Up_OutSystems/Use_your_SSL_domain_in_OutSystems_Cloud
If you change the internal names, there will be issues as you can see here.
https://success.outsystems.com/Documentation/11/Setup_and_maintain_your_OutSystems_infrastructure/Setting_Up_OutSystems/Configure_your_OutSystems_environment

So, if you really need to change them, you have to contact Support. But they will ask you why (changing a name in middle of the process usually means your initial plan was flawed and needs a review).