I did a quick survey of women with those names in my family tree who had gravestone with Hebrew inscriptions and ...
Sadye/Sadies were either Sarah, Sheyndl, or Zelda
Gussies was consistently Gittel
Surnames / Towns: Jaffe / Suchowola, Poland ; Stein (Sztejnsapir) / Bialystok and Rajgrod ; Roterozen / Rajgrod ; Joroff (Jaroff, Zarov) / Chernigov, Ukraine ; Schwartz (Schwarzstein) / Ternivka, Ukraine ; Weinblatt / Brooklyn, Perth Amboy, NJ ; Koshkin / Snovsk, Ukraine ; Rappoport / ? ; Braun / Wizajny, Suwalki, Ludwinowski / Wizajny, Suwalki