Could Allen be the perfect name for your baby boy? The baby boy name Allen is 5 letters long, and contains 2 vowel(s) and 3 consonant(s). Allen is a baby boy name that starts with the letter A and ends in the letter N. The baby boy name Allen has a popularity of 54% and is ranked 463 in the list of top 1000 most popular baby boy names. If Allen 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 Allen!