Tilly is a distinctive girls' name in United States, ranking #1029 in 2022 with 249 recorded births. The name reached its all-time peak in 2025 with 302 births ranking #885. Since 1996, the popularity has increased by 3,012.5%. In 2022, approximately 1 in every 6,581 girls born was named Tilly. RISING Recent data shows the name is currently rising.