The first time, all we know is that its a Jewish man, a shiksa and a sin. Now we get names. But it reiterates the event, that he was slain WITH her. If the deceased is a rasha then he won't remember his name and the angel will start beating him. All good questions.
Lets start with answering another question.
Parshas Shmos teaches us that the name defines the person. Ok, we could learn it from Breishis as well, when Adam named the animals. Everyone on earth has a specific purpose to help perfect the world. So our name is our G-dly purpose. Going a step further, our name is also our umbilical cord to Heaven.