One of my school friends was named after her Mum's favourite film, "Thoroughly Modern Millie". Quite unusual in the 70s.
Our harridan headmistress could not be doing with "shortened names" so every Kate was called Katherine (even if they were Kate), and Millie became Mildred - which she hated. She loves being a "Millie before her time".
As a side note: at one point, the headmistress became totally deranged about names and our schoolmate, Alice, became Alison; and Trudy (a frequently decorated sports captain) was once called Ermentrude! (Only happened once, as Trudy threatened to stop playing any sports which led to a PE department intervention).