Could Rio be the perfect name for your baby boy? The baby boy name Rio is 3 letters long, and contains 2 vowel(s) and 1 consonant(s). Rio is a baby boy name that starts with the letter R and ends in the letter O. The baby boy name Rio has a popularity of 22% and is ranked 783 in the list of top 1000 most popular baby boy names. If Rio 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 Rio!