I am not very familiar with how Chinese to English name conversions work, but I'll try and make names using Wang, Xixi and Wenxi as a basis.
Xixi sounds similar to Sasha so your name could be "Sasha Wang".
The Wen- in Wenxi is similar to Wendy so your name could also be "Wendy Wang".
If you're fine with choosing any name, how about one these:
Lucy
Olivia
Claire
Ronalda
Caroline
Those are just some random names. I think "Wendy Wang" has a nice ring to it.