> These names are all one-character long, rather than the standard two characters, and the surnames are some of the most common in China, so they end up having

> These names are all one-character long, rather than the standard two characters, and the surnames are some of the most common in China, so they end up having nonzero overlap. Two character given names aren't standard. At least in some places, in some families, they alternate between one and two characters from generation to generation.