Could Killian be the perfect name for your baby boy? The baby boy name Killian is 7 letters long, and contains 3 vowel(s) and 4 consonant(s). Killian is a baby boy name that starts with the letter K and ends in the letter N. The baby boy name Killian has a popularity of 65% and is ranked 351 in the list of top 1000 most popular baby boy names. If Killian 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 Killian!