Could Alonso be the perfect name for your baby boy? The baby boy name Alonso is 6 letters long, and contains 3 vowel(s) and 3 consonant(s). Alonso is a baby boy name that starts with the letter A and ends in the letter O. The baby boy name Alonso has a popularity of 22% and is ranked 782 in the list of top 1000 most popular baby boy names. If Alonso 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 Alonso!