Gender-Blender Name and
Tomboyish Name are long standing movie/
TV Tropes.
Bryan Fuller has used them in almost all of his shows which have female protagonists with male names/nicknames:
Dead Like Me has a girl named George (Georgia), and her sister, Reggie (Regina). Maybe their parents had a thing for feminine names with masculine short forms?
In
Pushing Daisies, leading lady Charlotte Charles is called Chuck (which is a derivative to Charles meaning "man"...), which is this and a
Punny Name put together.
Wonderfalls has a female main character named Jaye.
Hannibal has Freddie (short for Fredericka) Lounds, who is a
Gender Flip of a character from the
the source material with the same name.
So there's really nothing to see here. Move along, move along.