Milly is a distinctive girls' name in United States, ranking #2160 in 2015 with 88 recorded births. This places Milly in the top 11% of ranked US girls' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2014 with 129 births ranking #1657. Since 1996, the popularity has increased by 700.0%. In 2015, approximately 1 in every 20,280 girls born was named Milly. STABLE Recent data shows the name is currently stable.