Hi @thestift, and welcome to this community forum!
First of all, I’ve moved your question to a new topic as you’re question is not related to User administration / security: Delete an user from SonarQube database.
Then, it’s not possible to update the name of a user coming from an Identity Provider.
Why do you need to update the name of a user that do not exist anymore?
Regards,
Julien Lancelot