Names help translate the incomprehensible figure into meaningful, and, therefore, terrible reality. We don't mourn numbers, we mourn children, individual children, each one who had a name, each one was beloved, each one bore the divine image and embodied a whole world of promise. Each name represents and confers the reality of life, of an individual snuffed out by the Nazis. They understood the individuality in a name, and that is why one of the first things they did was to strip everyone of their name and replace them with a tattoo on their arms. Numbers have no history.
Numbers have no characters, have no reason to fight.
Numbers are lost into the pool of the collective. Bereft of names, the victims ceased to be human. It was that much easier for the Nazis to incinerate them because they were burning numbers, not people. Names carry humanity. Names in our tradition are very important.