Liu Gengrui means: "Geng" is the seventh place in Tiangan, and Geng is gold. Gold gives birth to water, and heaven, earth, people and the total number are all good.
Or, "Cheng" has water, "Ming" contains the rotation of the sun and the moon, including yin and yang, the five elements are self-reinforcing, and Tai Chi yin and yang are self-adjusting.