Why do Russian women have a [baby] after their names?

Brothers and sisters in the same family have the same father's name and surname, but their expressions are different because of their gender, mainly in the change of suffix. The male father's name is followed by a masculine suffix, most of which is "Vicky"; Women's father's name is followed by a suffix indicating femininity, and most of them are "Funa". The endings of men's surnames are mostly "husband" and "sky", while the endings of women's surnames are mostly "baby" and "Kaya". For example, if a brother and sister's father's surname is Ivanov, their father's name and surname are Ivanov (male) and Ivanovna Ivanova (female).