Your student workers should have name tags to wear!
This is a very interesting suggestion. One of our student workers at the desk suggested the very same thing. We do want to the Circulation desk & staff to be welcoming to library visitors; at the same time, we want the staff to be comfortable while at work, and sometimes name tags can make people uncomfortable.
So I can't give you a firm answer right now, but I can say that this is an idea I will continue to think about.