From the Roman name Iulianus, which was derived from Julius. This was the name of the last pagan Roman emperor, Julian the Apostate (4th century). It was also borne by several early saints, including the legendary Saint Julian the Hospitaller. This name has been used in England since the Middle Ages, at which time it was also a feminine name (from Juliana, eventually becoming Gillian).
Short form of names ending in lita. This name was brought to the public eye in the 1920s due to Lita Grey (1908-1995), who was the second wife of Charlie Chaplin. Her birth name was Lillita Louise MacMurray.