I love
Cynthia but not
Cindy. One of my friends in high school was a
Cynthia who was always called
Cindy. There was another
Cynthia in my class who wanted to be called
Cynthia and not
Cindy, but I noticed that she had to correct people, including teachers, who would call her
Cindy.
Cynthia is too dated for me to consider using, anyway.