There are two aspects here:
First, is data that stored in this node  - we don't know the subsidiary name, only brand name/operator - that is filled in the data. To repeat data in another field adds nothing to the database.
Second, is the display and search. Search will find this node for clalit search. About display, I'm not sure that this adds to the user if he looking at map and not searching.
All that said, you can add generic name to the name tag if local name is not known - it is not against rules rules, only not in the line with agreements.