Kacper is a distinctive boys' name in United States, ranking #7412 in 2025 with 11 recorded births. The name reached its all-time peak in 2007 with 88 births ranking #1714. Since 1996, the popularity has increased by 22.2%. In 2025, approximately 1 in every 155,280 boys born was named Kacper. STABLE Recent data shows the name is currently stable.