Jillian is a common female name that has origins in the Latin name Julius. It is often associated with qualities such as youthfulness and vitality. The name has gained popularity in various cultures and is frequently used in English-speaking countries. In popular culture, Jillian can refer to characters in movies, books, or television shows. For example, Jillian Michaels is a well-known fitness expert and television personality, recognized for her role on the reality show The Biggest Loser. The name is also used in various forms of media, contributing to its recognition and appeal.