All around the world, Біллі (Billi 
, Біллі 
) is quite a common unisex first name. The given name Біллі is habitual in the Dominican Republic, where it is a rare masculine name, Algeria, where it is a rare dominantly boy's, but infrequently girly name, and Cameroon, where it is a rare masculine name. Measured by absolute frequency, it most frequently occurs in the United States, India, and Indonesia. Also, Біллі is the last name as well as the forename.