Surely, Winters would at least count as ''black?''
I'm not sure how ethnicity works in the ED universe, we really haven't gotten to know that much about this kind of thing. It does seem like there's some kind of regional culture though, or, at the very least, different cultures. Until just recently, the systems were also a lot more separated, with interstellar journeys taking days or weeks, so I think it makes sense that there's lots of local languages and cultures, especially in the independent systems.