Coleby is a unisex given name of English origin, derived from the Old Norse elements 'kóli' meaning 'coal-black' and 'býr' signifying 'settlement' or 'farm'. This suggests that Coleby was originally an inhabitant's name for someone who lived near a dark-colored settlement. The name has gained popularity in recent times, particularly in English-speaking countries. It is often seen as a unique alternative to more common names like Cole or Barry, offering parents the opportunity to choose something distinctive yet still familiar-sounding.
The number of births named Coleby peaked between 1996 and 2002, with a high of 19 births in 2001. However, the name's popularity has since declined, with only 6 births each in 2009 and 2010.