What does it mean to recruit a younger brother?

What does it mean to recruit a younger brother?

This also starts with the society’s preference for boys over girls. Zhaodi means to recruit younger brothers. In other words, before giving birth to the girl "Zhao Di", the parents originally hoped to have a boy. But what should I do if I am born a girl? Then name this girl Zhaodi, which means to attract a younger brother and give birth to a boy!

Similar names include Yindi, Laidi, etc. I have a colleague named Yindi. Her parents are very patriarchal, so she has never been very happy.