Milly is a moderately popular girls' name in England & Wales, ranking #130 in 2003 with 380 recorded births. The name reached its all-time peak in 2004 with 460 births ranking #116. Since 1996, the popularity has increased by 675.5%. In 2003, approximately 1 in every 733 girls born was named Milly. FALLING Recent data shows the name is currently falling.