Milly is a moderately popular girls' name in England & Wales, ranking #132 in 2006 with 412 recorded births. The name reached its all-time peak in 2004 with 460 births ranking #116. Since 1996, the popularity has increased by 740.8%. In 2006, approximately 1 in every 726 girls born was named Milly. FALLING Recent data shows the name is currently falling.