In WOW, my name is Qiqi. The "seven" of one, two, three, four, five, six, seven. Why? Because it is easy to remember and easy to pronounce.
A girl named "Zhu Qiqi" once appeared in Mr. Gu Long's novels. Later, someone asked him, why not call her "Liu Liu", "Eight Eight", "Nine Nine" and "Ten Ten"? The teacher said that among all the numbers, "qiqi" is the easiest to pronounce.