Nan Zhang
Well, her name is 'Kati' and it might sound a bit Japanese, but actually it's a Hungarian name.(Hungary is a small Eastern European country)
Her surname is 'Farkas'(source: imdb), which is also a Hungarian word. It means 'wolf'.
So the Frage is: why does an Asian actress (Nan Zhang) play a Hungarian character? Probably the creators thought 'Kati' must be a Japanese name LoL
But I'm really glad that I've found something Hungarian on Gossip Girl cause I'm from Hungary, too...:)
---I had to share this... LoL---
Hungary
