Stephen Daniel Harper I hope you continue the tree for Billie Holiday which I’ve made into a Master Profile, but it’s lacking biography etc.
As far as I can tell, her mother had no surname at birth.
Sarah ‘Sadie’ (unknown) (Harris) Fagan
The resource to use is, in my opinion, Nicholson, Stuart (1995). Billie Holiday. Boston: Northeastern University Press. ISBN 9781555532482 – via Internet Archive (Kahle/Austin Foundation) Page 17-19 < link > (free ID needed to borrow)
Because the records are especially difficult for the women in the family.