I'm rereading 16, and something that sticks out is when they're perusing the list of known Controllers they come across Chapman and it gets dismissed as being random due to being a common name. Presumably the list uses full names. How many Hedricks do these kids know?
I mean, the name Chapman is hella common. I don't have any stats on this (googling it just turns up ads for Chapman U; this dystopia sucks) but it seems very popular. I used to live next door to 4 Chapmans, I get groceries on Chapman Ave, I have 3 former and 1 current coworkers named Chapman, and I bought my car from a Chapman. My desktop art is by 2 Chapmans, and Wikipedia says there are 17 cities called Chapman in the U.S. Even K.A. Applegate has reused it — in Saving Sam, Animorphs, and Crenshaw.
Also, real talk: do the kids have any idea what their vice principal's first name is? I couldn't have told you any of my teachers' first names when I was in middle school. Heck, even today I couldn't tell you the first name of my middle school principal, and I had regular conversations with her from ages 11 to 18.