Lucy Liu's surname DOES NOT mean "Willow" as someone has posted. Her surname is rather an ancient Chinese character meaning "to kill". Now this character is used today exclusively as a surname in Modern Chinese. Willow is a different Chinese character.
Kwan, the Chinese surname doesn't mean "mountain" as someone has posted. "Kwan" in Cantonese is "Guan" in Mandarin, meaning "mountain pass". "Mountain" is "shan" in Chinese.
How do I know? I'm Chinese. Unfortunately, I'm not able to make these corrections myself.
I hope someone can make these corrections. People come here for directions, not misguidance. Thank you.