Millie is a popular girls' name in United States, ranking #86 in 2024 with 2,910 recorded births. The name reached its all-time peak in 2024 with 2,910 births ranking #86. Since 1996, the popularity has increased by 8,458.8%. In 2024, approximately 1 in every 554 girls born was named Millie. RISING Recent data shows the name is currently rising.