Coleby is a distinctive boys' name in United States, ranking #8670 in 1998 with 6 recorded births. The name reached its all-time peak in 2001 with 19 births ranking #4153. Since 1996, the popularity has decreased by 53.8%. In 1998, approximately 1 in every 318,553 boys born was named Coleby. FALLING Recent data shows the name is currently falling.