Could Jax be the perfect name for your baby boy? The baby boy name Jax is 3 letters long, and contains 1 vowel(s) and 2 consonant(s). Jax is a baby boy name that starts with the letter J and ends in the letter X. The baby boy name Jax has a popularity of 73% and is ranked 273 in the list of top 1000 most popular baby boy names. If Jax 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 Jax!