What do you mean by recruiting a younger brother?

What do you mean by recruiting a younger brother?

This should also start with a patriarchal atmosphere in society. To recruit a younger brother is to recruit a younger brother. That is to say, before giving birth to the girl "Zhao Di", my parents had hoped to give birth to a boy. But what if you were born a girl? Then give the girl a name, which means to recruit a younger brother and have a boy!

Similar names include Yin Di, Reddy, etc. I have a colleague named Yin Di. Her parents' preference for sons is particularly serious, so she has been unhappy.