Milly is a moderately popular girls' name in England & Wales, ranking #137 in 2005 with 389 recorded births. The name reached its all-time peak in 2004 with 460 births ranking #116. Since 1996, the popularity has increased by 693.9%. In 2005, approximately 1 in every 741 girls born was named Milly. FALLING Recent data shows the name is currently falling.