Another factor in those class-ridden days may have been the practice of referring to servants merely as 'Mrs Whosit's maid'. There was also the habit of referring to married women by their husband's name. So if Fred Smith was saved, was it Mr Fred Smith, or Mrs Fred Smith?
Early reports of lost and saved even listed people who never went near the ship. George Eastman of Kodak was a notable example. I know of one modern book that has Lady Cynthia Asquith, the British PM's daughter-in-law on board. It's a real minefield.