Calahan is a distinctive boys' name in United States, ranking #7748 in 2002 with 8 recorded births. The name reached its all-time peak in 2025 with 26 births ranking #4063. Since 1996, the popularity has decreased by 11.1%. In 2002, approximately 1 in every 242,684 boys born was named Calahan. RISING Recent data shows the name is currently rising.