Author Ethnicity, Gender
I wonder how many people think, by reading my writing, that I'm a woman? I'm not, but I've been referred to in the feminine sense by other writers who mistook my writing style for that of a lady.
I personally don't think women necessarily write different than men, or vice-versa. I think of writing as, well, writing. I can name at least one book I have in my library--Dragonsdawn by Anne McCaffrey--that does not, in my opinion, read from a feminine viewpoint. As a man, I can fully identify with the male characters just as dandily in that book as if a man had written it.
As for ethnic names: I know he's been mentioned, but Lawrence Yep writes some wonderful stuff. He wrote a Star Trek novel a long time ago, which I thoroughly enjoyed; and his series about a Chinese dragon princess--I don't know the title of the original book, although I have read it: the one that stands out in my mind is Dragon Steel, which I believe is the second one in the series--is, so far as I can tell, quite popular.
Personally, I don't look for the author's ethnicity or gender when selecting a book; what matters to me is if the story title and cover, as well as its subject matter, grabs my attention. For me, if you haven't already guessed, it's dragons and the like that generally decide for me what books I will and will not buy.
With me, as a reader, the author's ethnicity and/or gender are never a deciding factor in whether or not I buy a book.