Does anyone have a solution for pulling over the owner of a record from a standard object to a custom object? 
Tried using the cross object formula but it only pulls the owner ID and I am looking for the actual owner name.  My users are looking for the field to "auto-populate" rather than have to use a look up.  Any thoughts?

Example:
Opportunity Owner - need to pull the owner name into a custom object
The two objects currently share a master-detail relationship with the opportunity as the master