1. the Email of your friend in your iPhone address book must represent his/her iCloud-account resp. Apple-ID Email AND 2. your friend has the iZeeYu app installed on his/her iPhone THEN his name will pull-up automatically into your iZeeYu address book.
Thanks to our families and friends who helped us. Just to name a few: Kristin, Bettina, Fernando, Natalia, Jun, Gonzalo, Fei Fei, Chrisy, Meixia, Chong, Valentina, ... Melanie and Pati.