Blue skies are ahead with this Swiss girl’s name. Derived from the Latin word _coelestis_ meaning “sky blue,” the name Coelestin harkens back to a time when Switzerland was part of the Roman Empire and Latin was the spoken language. Coelestin is also the name of an eye-catching mineral that was named for its characteristic blue color. _Coelestis_ has additional meanings of “heavenly” and “celestial,” resulting in the delicate and otherworldly Celestine. This variation has overtaken the traditional Coelestin in popularity, but the old-fashioned spelling might just prove to be as unique as your little one.