Jillian is associated with the meaning “Youthful, downy-bearded, or soft-haired” — a beautiful sentiment to see brought to life in your child’s room.
Jillian is a feminine form of Julian, which traces back to the Latin name Julianus. That name comes from the Roman family name Julius, meaning "youthful" or "downy-bearded," referring to the soft first beard of a young man. It connects all the way back to the ancient Roman gens Julia, one of Rome's most powerful families.