Could Colby be the perfect name for your baby boy? The baby boy name Colby is 5 letters long, and contains 1 vowel(s) and 4 consonant(s). Colby is a baby boy name that starts with the letter C and ends in the letter Y. The baby boy name Colby has a popularity of 38% and is ranked 617 in the list of top 1000 most popular baby boy names. If Colby isn't the ideal name for your baby boy then take a look here for some randomly generated names. Hopefully you'll find a more suitable first name for your baby boy than Colby!