Coleby is a distinctive boys' name in United States, ranking #7646 in 2004 with 9 recorded births. The name reached its all-time peak in 2001 with 19 births ranking #4153. Since 1996, the popularity has decreased by 30.8%. In 2004, approximately 1 in every 220,534 boys born was named Coleby. FALLING Recent data shows the name is currently falling.