This is part of creating a safe and secure workplace, but the name tags' purpose -- to enhance employees' public service awareness -- remains the same.

How does someone only knowing my surname lessen my chance of being harassed?

To protect employees' personal information being searched on the web based on name tag information and or info posted to social media.

Yes, I guess that might be true, K3PO, but it says "harassment by visitors," implying those visiting, not harassment by citizens, and doesn't explicitly mention online harassment.

My experiences are more that they sometimes enjoy harassing the visitors. They hand out something, a card, paper, whatever, after one or two hours of waiting, then call you at home, telling it is an error what had handed out and then you have to pay again transportation fee to go there, for getting the corrected paper, of course again after waiting for one or two hours. That is the harassment there and nothing can or will be done.

@Sven Asai

Usually,I disagree with your opinions,but in this case,you hit the nail on the head!