Literature Reference: 彦，俊彦也；俞，允也。—— 《说文解字》 Yan, refers to talented individuals; Yu, signifies approval. Source from 'Shuowen Jiezi'.
彦: A person of exceptional talent and distinction.
俞: "Permission granted, with a joyful and harmonious demeanor."
Meaning: Yan represents outstanding talent and virtue, while Yu signifies approval and recognition, implying exceptional intellect and respect.