I know that Sasha is a unisex name but honestly where I am, I think some people would be confused if they met a boy called Sasha. It's really mainly just a girl's name here.
I like it, as someone else said, it's pretty, and easy to spell. I know a couple of Sasha's... So I wouldn't use it, but in saying that it is not a common name.
I say go for it!