The numbers in Japanese names really don't have any special meaning. The numbers in these names mean to take as many names as possible. This is also because Japan was either at war or on the way to war before, resulting in a shortage of male population. Can't meet the needs of fertility, population decline, and the army can't be supplemented by personnel. The Japanese state gave orders when it was forced.
Women can give birth at any time and any place, without any restrictions, as long as they can give birth safely. So there are Kudou Shinichi, Shinzo Abe, Yamamoto XI and even the names of 56. Japan is far more than such names, and surnames such as Shinichi Inoue, Fujiichi Yamanaka, Tanaka and Matsushita all correspond to local places. It means that these people were born in the mountains or fields or even next to wells, so they took these surnames directly.
It can be said that Japanese names are not passed down from generation to generation, and most people choose their names according to their own wishes. Even the name is simple, in the name of numbers. This is also due to the shortage of population in Japan before World War II, which could not meet the needs of national conscription. Women are responsible for giving birth, taking care of the family and bringing up children, and men go to enlist and fight as long as they meet their age. So that when her husband died during the war, she sought another partner to continue to have children, which is why there are so many surnames in Japan.
Today, Japan still retains these bad traditions, and women keep a family as before. Men earn money to support their families. Although not all men are recruiting, some bad ideas still remain. Now Japan is still the same preference for boys, and women have no position.