Milly is a moderately popular girls' name in England & Wales, ranking #377 in 2015 with 120 recorded births. This places Milly in the top 5% of ranked UK girls' names for the year. Its actual usage is classified as Moderately Popular. The name reached its all-time peak in 2004 with 460 births ranking #116. Since 1996, the popularity has increased by 144.9%. In 2015, approximately 1 in every 2,566 girls born was named Milly. FALLING Recent data shows the name is currently falling.