With ‘name’, I assume you mean the attribute ‘name’ of entity System.User? Users can not see other user’s User/Name because that would be a security-violation since User/Name and User/Password are their credentials. You generally don’t want to share them with everybody, not even just User/Name.
You instead want to show the other user’s real name. To do that you would need to create another entity Person, having attribute Name and 1-1 association to System.User and show Person/Name.
Edited: System/User does not allow anybody to create a 1-1 association to another entity (Why? Beats me). That is why module ‘Administration’ created a specialization of System/User: entity ‘Account’ and they use that as if it is a Person. Both User and Account are a user-account.