Yes, you are right, there are a lot of unknown biografies, but the strange thing is that not only those that spoke not english are among the "unknown". There are a lot of people both from England as well as from Ireland, a lot of them part of the crew, that are described only by the name, age and last given adress. That is pretty wired, I believe, because if I can find difficulties to find out informations about Luigi Crovella, who was an italian immigrant from a poor family that probably didn`t had the right connections or even informations for claiming any damage to the White Star Line, that shouldn`t have been the case of the English families of those crew members that died. And one has only to look at the lists with those from engineering, victualling and even deck to see how many brief biografies there are.