I went to school with a Sasha - boy.

And uni with Sascha - girl. She had a brother named Tegan. Most people thought this was a bit weird as the had the opposite sex' names. I quite like both!

I would add the C in for a girl. And I prefer it as a girls name.
DD is Sascha so I love it
It is different and not very common without being weird IYKWIM.