Could Alonzo be the perfect name for your baby boy? The baby boy name Alonzo is 6 letters long, and contains 3 vowel(s) and 3 consonant(s). Alonzo is a baby boy name that starts with the letter A and ends in the letter O. The baby boy name Alonzo has a popularity of 53% and is ranked 471 in the list of top 1000 most popular baby boy names. If Alonzo 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 Alonzo!