Demi can be short for the name Demetria, Demitra or Demitria.
The name Demetria comes from the Greek goddess Demeter, goddess of fertility, also known as Earth Mother.
If you're referring to Demi Moore, her real namd is Demetria Gene Guynes.
Asked in Demi Lovato
Where did Demi Lovato get her name?
Her parents thought she was going to be a boy and wanted to name her "Dylan." but she was a girl instead and they didn't have a name. So the nurse threw a baby name book at her mom and told her to pick because they needed the name for the birth certificate. They chose Demetria so she could go by Demi for short. Demetria Devonne Lovato is her full name ...