Coleby is a distinctive boys' name in United States, ranking #5984 in 2000 with 11 recorded births. This places Coleby in the top 49% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2001 with 19 births ranking #4153. Since 1996, the popularity has decreased by 15.4%. In 2000, approximately 1 in every 178,539 boys born was named Coleby. FALLING Recent data shows the name is currently falling.