Milly is a distinctive girls' name in United States, ranking #4080 in 2001 with 31 recorded births. This places Milly in the top 23% 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 181.8%. In 2001, approximately 1 in every 58,083 girls born was named Milly. STABLE Recent data shows the name is currently stable.