Milly is a distinctive girls' name in United States, ranking #1736 in 2021 with 119 recorded births. The name reached its all-time peak in 2014 with 129 births ranking #1657. Since 1996, the popularity has increased by 981.8%. In 2021, approximately 1 in every 13,779 girls born was named Milly. STABLE Recent data shows the name is currently stable.