Apple Photos has given the same name to dozens of photos, as if they were different people
You can simply merge people.

On iOS:


Go to People folder in Photos app
Click on 'Select' (top right corner)
Select the people you want to merge
Click on 'Merge' (bottom right corner)
It shows an alert, you choose 'Merge'




On Mac:


Go to People tab in Photos app
Select the people you want to merge
Right mouse click and choose 'Merge'
It shows an alert, you choose 'Merge'