Maybe I am wrong but I guess the algorithm give some kind of confidence level for the facial recognition and the higher value would probably be the right guess.
Would it possible to show the 3 first guesses when doing a right click confirm “person”? Another possibility would be to split the “This is …” column of people in two parts, the first one with the best guesses and the second one with the rest of the names.
As I have a lot of names (big family) the list is much longer than the height of my screen, having the best guesses would make the identification task way faster and easier.