Literature Reference: The phrase 'Yun Cheng' is derived from 'Shang Shu·Da Yu Mo': 'Hold fast to the mean, be precise and single-minded.'
允: Promise, to permit. It metaphorically signifies honesty and trustworthiness, ensuring that every commitment is fulfilled.
诚: Integrity and Simplicity, embodying honesty. When used in personal names, it often signifies a person's genuine sincerity, trustworthiness, and the commendable quality of keeping one's word without fail.
Meaning: Yun Cheng signifies honesty, consistency in words and deeds, and adherence to the doctrine of the mean.