The grace of the Lord may refer to the grace of the Lord. In western culture, "Lord" is often used to represent God or the gods, while "grace" is God's favor to mankind. Therefore, the Lord's grace may be a devout Christian, or a person inspired by the Lord's grace, using the screen name to express his faith and love.
The Lord's grace may have other meanings. In ancient China, "dreams" could represent secret or unknown things. And "the grace of the Lord" may represent some special protection or blessing. So the Lord may want to express that he has some mysterious power or is in a special environment, so he uses this screen name to increase his mystery and particularity.
There is a simpler explanation for God's grace. Some people may like to use the online names of some religions to express their inner beliefs or respect, but in fact, the names themselves do not have much profound meaning. Therefore, it is also possible that Zhuen is just an old-looking name with a certain sense of sacredness, so some netizens will choose to use it to cover up their personality characteristics and hobbies.