Could Jonas be the perfect name for your baby boy? The baby boy name Jonas is 5 letters long, and contains 2 vowel(s) and 3 consonant(s). Jonas is a baby boy name that starts with the letter J and ends in the letter S. The baby boy name Jonas has a popularity of 51% and is ranked 486 in the list of top 1000 most popular baby boy names. If Jonas 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 Jonas!