Just use first name or nickname when tagging your contacts, and Prosopagnosia will automatically find matching contacts in your address book.

Starting with version 8.0.2 rudimentary address book integration is built into iPhoto, which allows you tag Faces using the contacts found in your address book. Prosopagnosia, however, takes this one step further, allowing you to transfer contacts from other address sources than Apple Address Book as well as transferring contact information into already existing Faces.

Prosopagnosia can also set contact images in Address Book, Gmail and Entourage using the face key images from your iPhoto Library. When setting contact images in the address book this will in turn sync the contact images to your iPhone or iPod Touch.

Supported address sources

Apple Address Book
Gmail
Mozilla Thunderbird
Microsoft Entourage 2008

System Requirements

Mac OS X 10.5.6 or higher
iLife 09 or iLife 11