The Evil Queen is named Queen Ravenna in this version and she's played by Charlize Theron for a second time. Emily Blunt plays the Ice Queen named Freya from the Hans Christian Andersen story Snedronningen which is translated into the Snow Queen. The animated cartoon film Frozen is based on the Hans Christian Anderson story the Snow Queen. Well, The Huntsman: Winter's War is half Snow White and the Seven Dwarfs (Only because the Huntsman and Queen Ravenna are the only recurring characters from the first film) and half the Snow Queen. And because Chris Hemsworth needs to have a female to make out with, a brand new girlfriend character is invented which has no fairy tale equivalent. This brand new girlfriend character is a female Huntsman (Actually a Huntswoman) named Sara played by Jessica Chastain. Or perhaps Sara is a variation of Gerda (Who was the heroine in the Hans Christian Anderson story the Snow Queen who was renamed Anna in the animated cartoon Frozen). So it's Gerda aka Anna aka Sara and the Seven Dwarfs? Hey, it could happen.
Another reason for the merger between Snow White and the Seven Dwarfs and the Snow Queen was that Jessica Chastain never slept with a happily married film director (Which was the reason why this version of Snow White and the Seven Dwarfs had a drastic shakeup in the recurring cast of characters).