Could Castiel be the perfect name for your baby boy? The baby boy name Castiel is 7 letters long, and contains 3 vowel(s) and 4 consonant(s). Castiel is a baby boy name that starts with the letter C and ends in the letter L. The baby boy name Castiel has a popularity of 18% and is ranked 824 in the list of top 1000 most popular baby boy names. If Castiel 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 Castiel!