Just making sure whether this is okay.
Ask them, be told by someone else, find out some way that allows you to pair the description of them with an already identified description of the man through a photo or someones testimony. Either way, someone has to give you the name and it's entirely possible that other people know the person you're trying to find the name of by different names and this is also IC.
Are there ways to identify someone using said chips? Probably. Find out IC.