Slim is an uncommon given name of American origin, derived from the English surname which itself originates from Middle English 'slym', meaning 'slender' or 'thin'. The name Slim was popularized during the 20th century, with notable bearers including Slim Pickens, a rodeo cowboy and actor known for his roles in Western films.
Slim as a girl's name experienced limited popularity with only 12 recorded births between 1904 and 1918.