All the branches of Wing Chun that are popular today seem to come from Yip Man e.g. Leung Ting, William Cheung, Yip Chun etc.

But what about any branches that came from further back?

What became of the other students of Chan Wah Shun for example? Or the other students of Leung Yee Tai? Have their branches of Wing Chun also survived?