Could Cullen be the perfect name for your baby boy? The baby boy name Cullen is 6 letters long, and contains 2 vowel(s) and 4 consonant(s). Cullen is a baby boy name that starts with the letter C and ends in the letter N. The baby boy name Cullen has a popularity of 32% and is ranked 684 in the list of top 1000 most popular baby boy names. If Cullen 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 Cullen!