Apparently Wanko is a chain of women's clothing shops in Hong Kong and Singapore.
I wonder if this is a deliberate attempt to generate interest from notoriety? Like FCUK did several years ago with great success. See also this post of mine.
Anyway, it provided several minutes of amusement. Part of which involved coming up with at least a dozen similar names for all sorts of businesses...
A funny write-up can be had here, complete with strangely posed photos.