Calahan is a distinctive boys' name in United States, ranking #9261 in 2005 with 7 recorded births. The name reached its all-time peak in 2025 with 26 births ranking #4063. Since 1996, the popularity has decreased by 22.2%. In 2005, approximately 1 in every 285,307 boys born was named Calahan. RISING Recent data shows the name is currently rising.