The name Scarlett is of English origin and means "Red." The origin is the culture in which the name originated, or in the case of a word--the language in which it most appears.
The name/word scarlett is most associated with the deep red color. Common spelling variations include Scarlet and Scarlette.
Actress Scarlett Johansson may be a reason for the newest popularity of this name. The name is most associated with the character Scarlett O'Hara from the 1930s novel and movie, Gone With the Wind. Scarlett O'Connor is a character on the TV show Nashville.
Renowned book titles include The Scarlet Letter by Nathaniel Hawthorne and The Scarlet Pimpernel by Baroness Orczy.