Is there a way to re-run facial recognition?
I have spent hours and hours working on the 'un-named people'. Now that so many of them have been identified manually (most of the people were already identified by Photoshop in other pictures) is there a way to rerun the facial recognition so that it will use those?
I think you are asking about reindexing which can't be done. There are a few 'hack' methods that people have tried that sometimes work. Here's a long thread about the topic How to reindex facial recognition data in LR 6?
You might find some helpful suggestions in here.