Calahan is a distinctive boys' name in United States, ranking #12567 in 2012 with 5 recorded births. This places Calahan in the bottom 12% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2025 with 26 births ranking #4063. Since 1996, the popularity has decreased by 44.4%. In 2012, approximately 1 in every 379,325 boys born was named Calahan. RISING Recent data shows the name is currently rising.