:Absolutely. There is WP:ENGVAR to consider: if the page was started with British English, that should be maintained (I haven't looked, but the first nonstub version would be controlling); but bok choy is not an Americanism and is by far the WP:COMMONNAME of this foodstuff and is used as such even in England, which is inconsistent within the UK and throughout the Commonwealth as to what is "Chinese cabbage", what isn't, etc. So, yes, please do clean it up if you have time.