Real name is Goh Kiat Chun. See http://yeinjee.com/asianpop/wu-chun-profile-and-biography/ for more info
Kevin Wu.
If you are talking about the Empress Wu of Tang Dyasty, Empress Wu's birth name is Wu Mei Niang( 武媚娘)。She is also known as Wu ZeTian.
Sun Wu
TBA
Kevjumba's real name is Kevin Wu. He's known for his comedy videos on Youtube.
Jacky Wu's birth name is Wu Jing.
Vivian Wu's birth name is Junmei Wu.
Lala Wu's birth name is Gang Wu.
Wu Bai's birth name is Jun-Lin Wu.
Vanness Wu's birth name is Vanness S. Wu.
Myolie Wu's birth name is Wu Hang Yee.
Johnny Wu's birth name is Johnny Kai-Tsen Wu.