Milly is a distinctive girls' name in United States, ranking #4047 in 2002 with 32 recorded births. The name reached its all-time peak in 2014 with 129 births ranking #1657. Since 1996, the popularity has increased by 190.9%. In 2002, approximately 1 in every 56,151 girls born was named Milly. STABLE Recent data shows the name is currently stable.