Over the past 110 years, 21 677 girls and 5 boys have been named Millie. The name Millie ranks 862th in the United States among the most common names for girls. For the first time more than ten times newborns were named Millie in 1910. The peak of popularity of the name Millie came in the 1910s and 2010s. You can see absolute numbers and relative numbers on the chart. Indicators per 100K more accurately assess the popularity of the name.