Could Jack be the perfect name for your baby boy? The baby boy name Jack is 4 letters long, and contains 1 vowel(s) and 3 consonant(s). Jack is a baby boy name that starts with the letter J and ends in the letter K. The baby boy name Jack has a popularity of 98% and is ranked 21 in the list of top 1000 most popular baby boy names. If Jack 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 Jack!