The Clarkes in ANTR were 'generic' characters, representative of 2nd Class.in general, of the newly married couples on board, and of passengers killed in the water. There really was a young couple called Clarke in 2nd Class, but they were not newly-weds and the wife survived. The fictional Clarkes, incidentally, look and sound more like a 1st Class couple and are seen to be occupying a very fine stateroom far superior to most of those in 1st Class!