Milly is a distinctive girls' name in England & Wales, ranking #503 in 2017 with 86 recorded births. The name reached its all-time peak in 2004 with 460 births ranking #116. Since 1996, the popularity has increased by 75.5%. In 2017, approximately 1 in every 3,478 girls born was named Milly. FALLING Recent data shows the name is currently falling.