Could Demi be the perfect name for your baby girl? The baby girl name Demi is 4 letters long, and contains 2 vowel(s) and 2 consonant(s). Demi is a baby girl name that starts with the letter D and ends in the letter I. The baby girl name Demi has a popularity of 66% and is ranked 338 in the list of top 1000 most popular baby girl names. If Demi isn't the ideal name for your baby girl then take a look here for some randomly generated names. Hopefully you'll find a more suitable first name for your baby girl than Demi!