Colby is a distinctive boys' name in United States, ranking #615 in 2025 with 455 recorded births. The name reached its all-time peak in 2001 with 3,859 births ranking #99. Since 1996, the popularity has decreased by 66.1%. In 2025, approximately 1 in every 3,754 boys born was named Colby. STABLE Recent data shows the name is currently stable.