brownie (n.)
"benevolent goblin supposed to haunt old farmhouses in Scotland," 1510s, diminutive of brown "a wee brown man" (see brown (adj.)). The name for the junior branch of the Girl Guides or Girl Scouts is 1916, in reference to uniform color. Brownie point (1963) is sometimes associated with Brownie in the Scouting sense but is perhaps rather from brown-nose.