From @MikeEEE76 via Twitter:
"How do I change the name in the portal? i've updated account.windowsazure.com/Profile but it doesn't seem to have updated. I am the service admin and went into the /Profile URL above and updated the information there. I have indeed updated all of my subscriptions to the current information and that field is still sticking."
Provided documentation: aka.ms/d9631842
Thanks,
@AzureSupport