Milly is a moderately popular girls' name in England & Wales, ranking #147 in 2002 with 306 recorded births. The name reached its all-time peak in 2004 with 460 births ranking #116. Since 1996, the popularity has increased by 524.5%. In 2002, approximately 1 in every 874 girls born was named Milly. FALLING Recent data shows the name is currently falling.