Milly is a distinctive girls' name in United States, ranking #13189 in 1997 with 6 recorded births. This places Milly in the bottom 18% 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 decreased by 45.5%. In 1997, approximately 1 in every 290,110 girls born was named Milly. STABLE Recent data shows the name is currently stable.