Since it is a novel, there is no need to be so rigorous.
The reality you mentioned is not unreasonable. Chinese people have many taboos when naming names. Indeed, it is rare for names to have gods. But it can’t be said that there is none at all.
And the surname of gods also exists, but the number is very small, thousands at most.
The word "神" is used in people's names, mostly as nicknames or titles. For example, the God of Food, the God of Medicine, etc.
For a novel, a rare name is not bad, as long as it is easy to remember.