Wow! I was looking for a short answer, however I am more perplexed than when I started. So I am writing a historical novel, does this govern how I write the last name of my character when referring to his family: Montgomery. Should it be Montgomeries or Montgomerys? Either way, Word doesn't like either spelling. I liked how "Name ends with 'Y' mentioned language is constantly evolving, but in historical terms, do I follow the old rule? Please advise.