Milly is a distinctive girls' name in England & Wales, ranking #568 in 2018 with 73 recorded births. The name reached its all-time peak in 2004 with 460 births ranking #116. Since 1996, the popularity has increased by 49.0%. In 2018, approximately 1 in every 3,949 girls born was named Milly. FALLING Recent data shows the name is currently falling.