I am also researching the surname Kain or Cain. My 2nd great grandmother was Rachael Kain Sanders born 1850 Ohio, Her father was William "Billy", her mother was Louisa according to the 1850 census. Smith Kain was listed as a sibling. Other census' after that showed Wm's spouse as Mary. One of the census' is under William Carri. One of my relatives told me that the name Truman comes in but I don't know how either as a first name or surname. Any information would be greatly appreciated. Thank you.