It may be rare to have a single-letter surname, but most Chinese (and Koreans) have single-character surnames, which are being ignored in Top Surnames in projects.
BTW, wouldn't it make more sense (for some projects at least) that clicking on the surname directs one to a list of profiles WITHIN this project?
Actually, this Top Surnames feature as it is has little value to the user experience. I'm more worried if single-character surnames are being ignored in Geni's matches.