Could Sonny be the perfect name for your baby boy? The baby boy name Sonny is 5 letters long, and contains 1 vowel(s) and 4 consonant(s). Sonny is a baby boy name that starts with the letter S and ends in the letter Y. The baby boy name Sonny has a popularity of 22% and is ranked 777 in the list of top 1000 most popular baby boy names. If Sonny 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 Sonny!