Why do you call Xu Sui one by one?

There are two reasons for Xu to call one by one.

First of all, in the novel Confessions, Xu Sui tells himself that his nickname is Yi Yi, which stands for the only meaning. This is because of the influence of Xu Sui's family environment. Xu's father thought Xu was unique and unique, so he named it Yiyi.

Secondly, if you are asking why a planet named "Xu Sui" is called "Yi Yi", then its name may come from the naming rules for asteroids in China astronomical research circles. For some important asteroids, names with China characteristics are usually chosen, and "Rising Sun" may be such a planet. As for the naming rule of "11",it may be because it is one of the ways for asteroid observers in China to number asteroids during their observation. However, for the exact reason of the specific naming rules, I suggest you inquire about relevant astronomical data.