Who Are The 50 Students Who Die In Harry Potter 7?

At the very end of the book, we are told that Voldemort's body was laid in a separate chamber in Hogwarts , so that it would be away from the bodies of Fred Weasley, Nymphadora Tonks, Remus Lupin, Colin Creevey and "fifty others" who had also died fighting Voldemort.  We are not told if these fifty others were all students and we cannot possibly know, because many parents, teachers and others had gathered at the school to help in the final showdown.  All we know is that they were not named because they did not figure as characters in the stories.

There was at least one other named student who died, Vincent Crabbe.  He had been fighting for Voldemort and cast a fiendfyre spell to try and kill Harry, Ron and Hermione in the Room of Requirement.  They were able to rescue Malfoy and Goyle who were also there, but Crabbe was killed by his own spell, leaving behind no remains.

Only the author can answer that, besides they are only side characters that may or may not have even been ever refereed to in the books apart from that moment