I look at it from the perspective of ancient Chinese. I think there is no need for the word "子" in my sister's name, because in ancient Chinese "子" is a good name for a man, and it must refer to a male. Although it can also be translated as a daughter, it is rare. Let’s analyze the word "Xuan" again. This word means flying and comes from "Gui Yan Zai Xuan" in Wang Can's "Gift to Cai Zidu". Since they are the names of a brother and sister, and they have the same pronunciation as each other, I suggest that the younger sister be named Zi Qin. Zi is the name of a kind of tree, which means that children can be as tough and upright as trees; Qin means infiltration, which is translated in modern Chinese as making people happy. There are three bits of water in it, which gives the brothers and sisters the temperament of reaching for water from the sky~