Hi @daniel.vogel,
Welcome to the Auth0 Community!
Yes, in this context, the only way to update a user’s Family Name is to use the Management API’s Update a user endpoint.
There is currently no UI for editing these particular root attributes.
A user’s name usually comprises the user’s given name and family name. For example, if the given_name=John and family_name=Doe, we can say the user’s name=John Doe. The Nickname might be “Johnny,” for instance.
Does that help?
Cheers,
Rueben