If you rename a file in the outliner the OFPA name remains the same and the file is marked as “modified” in source control, that’s probably why they are not including it in the file name…
The file name is preserved even if you use the replace function and change the actor class completely, so you can’t even use the class default name as a name:
A workaround I personally use is copying the “nonsense file name” from my source control software and paste it in the outliner searchbar:
It works, it’s not very handy but at least it allows me to understand what the hell has been modified in a very slow way.
Remember that when we only had levels we were only able to see that the entire .umap file was modified and not which actor 
.
Also, if you enable “Revision control” in the outliner tabs, you should be able to easily identify which files have been modified (marked in green or yellow):
