Calahan is a distinctive boys' name in United States, ranking #4063 in 2025 with 26 recorded births. The name reached its all-time peak in 2025 with 26 births ranking #4063. Since 1996, the popularity has increased by 188.9%. In 2025, approximately 1 in every 65,695 boys born was named Calahan. RISING Recent data shows the name is currently rising.