I'm a Jennifer - I was just ahead of the surge, but the class after me never had less than 3 Jennifers (and usually 3-4 Christophers, too). Though, mostly because the name lends itself to nicknames, the most Jennifers I've ever worked with was 3 - plenty of Jenns, Jennys, etc. though.
You know what's even worse than having a same that everyone else has people? Having a name that NO ONE where you live, work, or go to school with has. I was the only person in my ENTIRE ELEMENTARY, MIDDLE, AND HIGH SCHOOLS with the name Ian and HOLY FUCK did the bullies sure LOVE to use that AGAINST ME!