Sorry, I didn't want to offend anyone. I know that most Chinese-Americans have western first names - but, they usually have Chinese last names too. Personally, I never make any assumptions these days about who is behind a particular name, but many people do. And like it or not, studies have found that names are a particular issue for adult transracial adoptees. Quite a large percentage of the adult Korean adoptees have gone back to their original Korean names, either legally, or just for use among other Koreans.
Take a look at this blog entry...
http://twicetherice.wordpress.com/2007/01/23/finding-our-own-names/