I do not see indexes for men very often, and I need them for sr, jr, i, ii, iii. You have them for women for miss or mrs, why not for men?
Miss, Mrs, Mr, Rev, Hon, etc. are prefixes. Sr, Jr, I, II, III are suffixes. It is rare to have prefix fields, and even more rare to see suffix fields. I suppose they figure it is enough to get the person to the image with a search on the name. They will see the suffixes.