Could Theo be the perfect name for your baby boy? The baby boy name Theo is 4 letters long, and contains 2 vowel(s) and 2 consonant(s). Theo is a baby boy name that starts with the letter T and ends in the letter O. The baby boy name Theo has a popularity of 90% and is ranked 99 in the list of top 1000 most popular baby boy names. If Theo 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 Theo!