Why is there a doubled name in the Photos app when I search to name faces?
One is the original name tag you supplied in iPhoto, the other is the closest possible Contact in your Address Book.

I went through the same process yesterday - trying to decide whether I wanted people tagged as names, or Contacts.  

I can find no way to switch it off - nor, even more irritatingly, how to assign all photos with a particular face to the Contact instead of the original name, other than one at a time…

Edit:
Simpler than I first thought - Select one 'Face' in the main faces screen, click the name &amp; start to type. Choose whether to use the Original tag name or the new Contact name. All similarly-tagged faces will be changed to the new system &amp; the old tag will vanish.

I made a silly one as an example…


a. Start to type, you have 2 alternatives, select the Contact name
b. Hit Enter, the Contact Name is embedded
c. Try to repeat the process… there is now only one choice for that person [or cat]




There's a huge, detailed Photos guide on iMore - How to use Photos for OS X: The ultimate guide