Jullie is of French origin, derived from the masculine name Julian. It means 'youthful' or 'downy', referring to the young and soft growth of hair on a youth's chin. The name gained popularity in English-speaking countries during the mid-20th century. In France, it is often used as a feminine form of Jules, which is itself a diminutive of Julius.
"The name Julie has seen varied popularity over the past century, with peak years being 1955 (14 births), 1967 (18 births), and 1962 (19 births). It experienced a decline in usage starting from the late 1970s, with fewer than 10 births per year since 1980. Recently, it has maintained a steady but low number of births, with most years recording between 5 to 7 births."