Literature Reference: Meng means eldest or beginning; Han refers to the Milky Way. Source from 'Shuowen Jiezi'.
孟:
Chu means the beginning. Meng signifies encouragement.
汉: The name of a river, the Han River, the largest tributary of the Yangtze River. It extends to signify vastness, benevolence, open-mindedness, and magnanimity.
Meaning: The name implies the eldest son is as vast and profound as the Milky Way, symbolizing breadth and depth of character.