Maybe better if, Sino ang mga kakilala mong tao doon?
Or, SIno ang kilala mong (sikat, magaling, taga-rito)"
Nuong is just noong also.
Noong is more formal. Nuong is spelled that way because the pronunciation in informal settings sounds more like noo-ong rather than noh-ong, thus the change in the spelling. They just change the spelling to nuong to accommodate the kind of pronunciation or accent the speaker is comfortable using.