Milly is a distinctive girls' name in United States, ranking #3164 in 2006 with 53 recorded births. The name reached its all-time peak in 2014 with 129 births ranking #1657. Since 1996, the popularity has increased by 381.8%. In 2006, approximately 1 in every 35,869 girls born was named Milly. STABLE Recent data shows the name is currently stable.