Could Jefferson be the perfect name for your baby boy? The baby boy name Jefferson is 9 letters long, and contains 3 vowel(s) and 6 consonant(s). Jefferson is a baby boy name that starts with the letter J and ends in the letter N. The baby boy name Jefferson has a popularity of 29% and is ranked 707 in the list of top 1000 most popular baby boy names. If Jefferson 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 Jefferson!