The word Crystal comes from Latin and Ancient Greek. The Latin form was crystallus meaning crystal or ice and the Ancient Greek form was Krystallos from Kryos meaning frost or ice. Kryos came from a photo-indo-European root Kru meaning a hard butter crust. Which is the cousin of crystal, meaning crust. Today people use crystal as a solid transparent matter. Also used as a female name, Crystal, Cristal, Krystal or Kristal.