Could Callum be the perfect name for your baby boy? The baby boy name Callum is 6 letters long, and contains 2 vowel(s) and 4 consonant(s). Callum is a baby boy name that starts with the letter C and ends in the letter M. The baby boy name Callum has a popularity of 67% and is ranked 335 in the list of top 1000 most popular baby boy names. If Callum 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 Callum!