Same thing happened to me, but I had a bad feeling about it. I was kinda outraged to hear my child's name from some unknown source. I looked up if anyone was posing as athem online and found this news article about scammers.
http://sanfrancisco.cbslocal.com/2015/02/06/a ... scam-insurance/
Found an article on news about scammers pretending to be athem after they had a security breech/hackers. http://sanfrancisco.cbslocal.com/2015/02/06/a ... scam-insurance/
An automated system called me and say they had an important reminder about my child, and said my child's complete name. I was busy and hung up, but they then called me on the weekend and say they wanted to verify my child's birth year. offering 2001 as the first choice. That made me think it was b.s. It is very likely that someone's child was born sometime after 2001!