I'm not sure where Dracotorix is from, but assuming she's not American, perhaps it's cultural, as other than the
Cynthia I mentioned in my post, every American
Cynthia I've known went by
Cindy. And even that
Cynthia had to constantly correct people.
Cindy is a very commonly used nickname for
Cynthia in the US, and most Americans will assume a
Cindy has
Cynthia on her birth certificate.