Calahan is a distinctive boys' name in United States, ranking #6939 in 1998 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 1998, approximately 1 in every 238,915 boys born was named Calahan. RISING Recent data shows the name is currently rising.