Cecilia Cheung Announces She’s Changing Her Name To “Unlock” Her “New Identity”
However, it looks like it was just part of her new gig as an e-commerce ambassador.

Changing one’s name in the middle of one’s showbiz career is actually quite common, with most celebs doing it for fengshui reasons or even ‘cos their old name was “too complicated”. However, such a decision may not always be well-received by the public.
Last Tuesday (Apr 20), Hongkong actress Cecilia Cheung suddenly announced that she will be going by a new Chinese name, and that she's gone from “张柏芝” (Zhang Bo Zhi) to “张百知” (Zhang Bai Zhi). The 40-year-old even changed her Weibo name to “I am Zhang Bai Zhi” to further drive the point home.
FYI, her new moniker can be loosely translated as Know-it-all.