Re Brownies:
“Brownies, originally called Rosebuds,[2] were first organised by Lord Baden-Powell in 1914 to complete the range of age groups for girls in Scouting. They were first run as the youngest group in the Guide Association by Agnes Baden-Powell, Lord Baden-Powell’s younger sister. In 1918, his wife, Lady Olave Baden-Powell, took over the responsibility for the Girl Guides and thus for Brownies.
Originally, the girls were called Rosebuds, but were renamed by Lord Baden-Powell after they complained that they did not like their name. Their name comes from the story “The Brownies” by Juliana Horatia Ewing, written in 1870. In the story, two children, Tommy and Betty, learn that children can be helpful brownies instead of being lazy boggarts.
In November 2022, the Girl Guides in Canada announced by January 2023 that they would rename this section of Guides, as it was deemed “a barrier to racialised girls and women” and to be more inclusive.[3] In January 2023, the name Brownies was changed to Embers.[4]”
From Wiki.
More interesting info: https://britishfairies.wordpress.com/2017/10/19/brownies-in-literature-from-mrs-ewing-to-dobby/