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Meng mèng is a phonetic form. The word Congzi means Congmengsheng, and the name Congmengsheng also sounds. "Meng" means "a man and a woman swear an oath to get married." "Zi" refers to children. "Zi" and "Meng (province)" combine to mean "the (first) child born after a man and a woman swear an oath to get married."
Original meaning: firstborn son. eldest son.
Explanation: "Meng" means to use a basin to face the sun and the moon to take river water once, and the two water flows into the basin and is called "Mingshui". "Mingshui" means the combination of yin and yang, and also means the sun and moon (heaven and earth) as witnesses. The "dish" containing "clear water" is equivalent to a bright mirror. When a man and a woman get married or friends become sworn brothers, the parties involved swear in front of the mirror that from now on they will live and die together and stay together through thick and thin.
Reference: "Shuowen": "Meng, Changye. Congzi, Pansheng". Case, "长" means the eldest son.
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