User Name of object Owner

I have an Overview page for a particular Entity where I would like the Owner Name for each Entity to be displayed. In the (Owner Name) Column I have the Attribute

System.owner/System.User/System.User.Name. As the Adminstrator I can see the names of all of the Owners against their Entities. However, non Admin users can only see their own names and blanks against Entities where they are not the Owner. How do I get the Owner Name to be viewable by all?

Many thanks.