Coleby is a distinctive boys' name in United States, ranking #9062 in 2007 with 8 recorded births. The name reached its all-time peak in 2001 with 19 births ranking #4153. Since 1996, the popularity has decreased by 38.5%. In 2007, approximately 1 in every 259,404 boys born was named Coleby. FALLING Recent data shows the name is currently falling.