It's a bit of a tounge twister, and I kind of had to sound it out letter by letter to see how to pronounce it, but other than that it's good. It does have too many s and sh sounds in it though...
Shasaia is definitely better than Shassiah. Shasiah, maybe, but I'd still try to say that SAH-shee-uh. I loke the spelling Shasaia a lot better.