Thanks for helping me on this case. I agree that
Dutch Feminine usage as a variant of
Sascha is plausible.
https://www.behindthename.com/name/sascha
It's also worth noting that I found Feminine bearers with this name.
https://en.wikipedia.org/wiki/Sacha_McMeekinghttps://en.wikipedia.org/wiki/Sacha_Parkinsonhttps://www.google.com/search?q=sacha+visagie
You can't judge a book by its cover!