why did the man doing the tattoos get so upset when hannah/chaya got hers?

The man tasked with tattooing the women, himself a prisoner, asks Hannah her name. She replies that it is Chaya Abramowicz. He tells her that she is wearing his daughter's dress. Her name was Chaya, too. He says to never forget her prisoner number and to live for all the Chayas of the world.

Source(s): http://www.gradesaver.com/the-devils-arithmetic/study-guide/section4/