Why do brothers and sisters in Northeast China have the same name?

In the past, children in China's extended family were all named according to their seniority. Usually, such families have genealogies, which are reproduced from generation to generation, and there are many collateral blood relatives. Every generation uses a word, usually in the order of a sentence, and it must be in the names of people of the same generation. This situation not only exists in the northeast, but also in all parts of the country.