Over the past 110 years, 51 288 girls and 6 boys have been named Lilly. The name Lilly ranks 516th in the United States among the most common names for girls. For the first time more than ten times newborns were named Lilly in 1910. The peak of popularity of the name Lilly came in the 2000s and 2010s. You can see absolute numbers and relative numbers on the chart. Indicators per 100K more accurately assess the popularity of the name.