The surname and first name in China Southern Airlines WeChat real-name authentication can be filled in according to the following steps:

1. Fill in the first or second word of last name. Common surnames are Zhao, Qian, Sun and Li, or common compound surnames are Ouyang and Zhuge.

2. Fill in all the words except the last name.

The above is the way to fill in the surname and first name in China Southern Airlines WeChat real-name authentication. If you encounter problems during the operation, it is recommended to consult WeChat customer service or the official customer service of China Southern Airlines for a more accurate filling method.