Coleby is a distinctive boys' name in United States, ranking #4008 in 1999 with 18 recorded births. The name reached its all-time peak in 2001 with 19 births ranking #4153. Since 1996, the popularity has increased by 38.5%. In 1999, approximately 1 in every 106,672 boys born was named Coleby. FALLING Recent data shows the name is currently falling.