Used as a diminutive for several names, such as Millicent, Amalia, Emily, Mildred, Camilla and other that contain the same sound.

Variants are: Milly, Emmy, Emmie, Em, Cammie, Amelia, Emilie, Milla, Emilia, Emelie, Melisende.

Famous bearers are: Millie Small, Millie Jackson, Millie Perkins, Millie Corretjer, Millie Ruperto.

Millie is a popular name in Scotland, England and Wales.