Milly is a distinctive girls' name in United States, ranking #1849 in 2008 with 116 recorded births. The name reached its all-time peak in 2014 with 129 births ranking #1657. Since 1996, the popularity has increased by 954.5%. In 2008, approximately 1 in every 16,299 girls born was named Milly. STABLE Recent data shows the name is currently stable.